BRAKES. DESCRIPTION The brake system consists of single disc brake assembly on each main landing gear wheel, master cylinder for each rudder pedal, hydraulic fluid reservoir, parking brake, and associated hydraulic plumbing. Serials & subs, 00 thru after SBX--: A brake temperature indicator is installed on each brake caliper piston housing. The indicator turns black if overheating occurs. Serials 06 & subs w/ Perspective Avionics: A brake temperature sensor is installed on each brake assembly. Brake temperature annunciations are displayed on the MFD. A caution annunciation occurs when brake temperature is between 70 F ( C) and F ( C). A warning annunciation occurs when brake temperature exceeds F ( C). 8 VDC is supplied through the ENG INST circuit breaker on the Main Bus. The hydraulically operated brakes are individually activated by floor mounted toe pedals located at both pilot stations. The master cylinders are located forward of the pilot s rudder pedals. The hydraulic fluid reservoir is located in the engine compartment on the upper RH side of the firewall. Serials 00 thru 0 before SBX--: The reservoir is serviced with MIL-H-606 hydraulic fluid. Serials 00 thru 0 after SBX--, & subs: The reservoir is serviced with MIL-PRF-877 hydraulic fluid. For disassembly/assembly of brake master cylinder refer to the manufacturer s approved Instructions For Continued Airworthiness. A parking brake mechanism holds induced hydraulic pressure on the disc brakes for parking. The parking brake system consists of a parking brake valve, control cable with knob, and associated hydraulic plumbing. The parking brake valve is mounted adjacent to the firewall on the LH side of the outboard console rib. Serials 00 thru 0, 06 & subs w/o Perspective Avionics: The parking brake control cable knob is mounted to the LH side of the mid console, adjacent to the alternate air controls. Serials 06 & subs w/ Perspective Avionics: The parking brake control cable handle is mounted to the LH kick plate. A position sensor, mounted adjacent to the parking brake valve actuation arm, sends position data to the MFD via the GEA 7 engine airframe unit. An alert indicates in the CAS window of the MFD when the parking brake is engaged. All Page Dec 0
. TROUBLESHOOTING Trouble Probable Cause Remedy Brake drag. Piston cocked in cylinder, resulting in overheating brake and/or excessive lining wear. Foreign matter wedged in brakes. Back pressure due to malfunction of master cylinder. Back pressure due to malfunction of parking brake valve. Wrong brake fluid has caused blocking of pistons. Water or ice in hydraulic system. Excessive bolt torque has caused back plate to crush cylinder, evidenced by depressions around bolt holes. Piston does not retract. Warped pressure plate. Corroded anchor bolts and/or torque plate bushings. Cocked anchor bolts and/or torque plate bushings. Remove and repair cylinder or piston. Replace brake assembly. (Refer to ) Locate and remove foreign matter. Perform Adjustment/Test - Bleeding the Brake System. (Refer to ) Repair or replace master cylinder. (Refer to ) Perform Adjustment/Test - Bleeding the Brake System. (Refer to ) Replace parking brake valve. (Refer to ) Change all seals of the brake system. Use correct brake fluid. (Refer to -0) Thaw ice and flush system. Perform Adjustment/Test - Bleeding the Brake System. (Refer to - ) Replace cylinder and follow manufacturer's recommended torque value. Perform Adjustment/Test - Bleeding the Brake System. (Refer to ) Remove piston and inspect for damage. (Refer to ) Replace pressure plate or flatten to within 0.00 inch (0. mm). (Refer to ) Clean and lubricate or replace. Replace anchor bolts and/or torque plate bushings. (Refer to ) Bent or cracked torque plate. Replace torque plate. (Refer to - ) Restriction in hydraulic line. Isolate and remove restriction. Page Dec 0 All
Trouble Probable Cause Remedy Brake drag. (continued) Lining out of position or stuck. Repair or replace lining. (Refer to ) Warped brake disk/disc. Lining not seated flush against pressure plate or back plate. Parking brake control cable stop incorrectly adjusted. Inspect brake disk/disc by laying a straightedge across brake disk face. Replace brake disk/disc. (Refer to ) Deburr rivet hole on surface adjacent to lining. Perform Inspection/Check - Parking Brake Control Cable. (Refer to ) Brakes inoperative. Brake fluid level low. Replenish brake fluid. (Refer to -0) Air in brake system. Defective master cylinder. Perform Adjustment/Test - Bleeding the Brake System. (Refer to ) Replace master cylinder. (Refer to ) Defective caliper. Replace caliper. (Refer to ) Worn brake linings. Perform Inspection/Check - Brake Temperature Indicator. (Refer to ) Replace O-rings. (Refer to ) Replace brake linings. (Refer to ) Leaky brake line connections Tighten or replace connectors. Parking brake inoperative. Parking brake valve defective. Replace parking brake valve. (Refer to ) Parking brake will not release. Brake overheating. Control cable stop incorrectly adjusted. Defective control cable. Improper and/or aggressive braking practices. Perform Inspection/Check - Parking Brake Control Cable. (Refer to ) Replace control cable. (Refer to ) Perform Inspection/Check - Brake Temperature Indicator. (Refer to ) Replace O-rings. (Refer to ) Replace brake linings. (Refer to ) All Page Dec 0
Trouble Probable Cause Remedy Rapid brake disk/disc and lining wear. Improper adjustment of master cylinder rod length restricting the development of maximum stroke. Adjust cylinder rod length. (Refer to ) Improper conditioning of brake linings. Perform Adjustment/Test - Conditioning Procedure for Brake Linings. (Refer to ) Unable to obtain sufficient hydraulic brake pressure, excessive toe pedal travel, or spongy pedal. Excessive rusting, scoring, or pitting of brake disk/disc. Excessive back plate deflection caused by bent bolts or over torquing bolts. Air in hydraulic system. Vent in master cylinder reservoir clogged. Leak in hydraulic system. Defective master cylinder. Back plate bolts loose or not properly torqued, causing excessive brake deflection. Excess bolt torque has caused back plate to crush cylinder, evidenced by depressions around bolt holes. Defective brake line (ballooning). Clean or replace brake disk/disc. Replace bolts. Torque bolts to proper value. Perform Adjustment/Test - Bleeding the Brake System. (Refer to ) Clean vent or overboard drain. Locate leak and repair. Replace or repair master cylinder. (Refer to ) Torque bolts to proper value. Replace cylinder. Replace brake line. Page Dec 0 All
Trouble Probable Cause Remedy Brakes won't hold. Contaminated brake lining. Replace brake lining. (Refer to - ) Improper conditioning of brake linings. Perform Adjustment/Test - Conditioning Procedure for Brake Linings. (Refer to ) Wrong brake fluid has caused blocking of pistons. Brake linings worn below minimum wear limits. Brake disk/disc worn below minimum wear limits. Brake lining carbonized (overheated). Change all seals of the brake system. Use correct brake fluid. (Refer to -0) Perform Inspection/Check - Brake Linings. (Refer to ) Refer to the manufacturer s approved Instructions For Continued Airworthiness. Perform Inspection/Check - Brake Temperature Indicator. (Refer to ) Replace brake lining. (Refer to - ) Pressure plate contacting torque plate assembly. New brake linings not seated in wear track of old brake disk/disc, resulting in partial contact with brake disk/disc. Check for correct torque plate and wheel installation. Refer to the manufacturer s approved Instructions For Continued Airworthiness. Brake fluid leaking. O-rings damaged. Replace O-rings. (Refer to ) Connections or hoses leaking. Cylinder scored/deteriorated or obstructed by debris. Locate leak and repair. Clean cylinder. Replace cylinder. All Page Dec 0
. MAINTENANCE PRACTICES A. Brake System Replenishing (Refer to -0) B. Brake Assembly - Serials 00 thru 0 before SBX-- (See Figure ) () Removal - Brake Assembly WARNING: Verify parking brake is in off position and wheels are blocked. (a) Remove main gear fairings. (Refer to -0) (b) Remove and cap hydraulic line attached to brake. Cap brake inlet fitting. (c) Serials 00 thru 600 before SBX--: Remove bolts and washers securing back plate to cylinder assembly. Remove back plate. (d) Serials 60 thru 0, 06 & subs w/o Perspective Avionics, 00 thru 600 after SBX--: Remove bolts and washers securing back plate and shim to cylinder assembly. Remove back plate and shim. (e) Serials 06 & subs w/ Perspective Avionics: Remove bolts and washers securing back plate, shim, and temperature sensor to cylinder assembly. Remove back plate, shim, and temperature sensor. (f) Carefully slide anchor bolts secured to cylinder assembly off torque plate. (g) If torque plate removal is required: Remove wheel/tire. (Refer to -) Remove bolts, nuts, and washers securing torque plate to axle flange. Remove torque plate. () Disassembly - Brake Assembly (a) Slide pressure plate over and off anchor bolts secured to cylinder assembly. (b) Remove piston(s) by injecting air into ports (-0 psi) [0 to 8 kpa] maximum pressure. Care should be used in handling O-ring(s) to prevent damage. (c) Remove O-ring(s) from piston(s). (d) Serials 60 thru 0, 00 thru 600 after SBX--: Remove friction springs from pistons. (e) Remove bleeder seat, screw, cap, and inlet fitting. (f) Remove anchor bolts secured to cylinder assembly, if necessary. (g) Remove brake linings, if necessary. (Refer to ) (h) Serials thru 0, 00 thru after SBX--: Remove brake temperature indicator. (Refer to ) () Reassembly - Brake Assembly Note: (a) Thoroughly clean parts before assembling. Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Arbor Press - Any Source Install anchor bolts. Page 6 Dec 0 All
Description P/N or Spec. Supplier Purpose O-Ring Lubricant Dow Corning O-Ring Lubricant Dow Chemical Co. Lubrication. Midland, Michigan 867 8-66-000 Silicon Spray - Any Source Lubrication. Mallet (plastic or wooden) - Any Source Piston installation. (b) If removed, install brake lining. (Refer to ) (c) If anchor bolts were removed, install anchor bolts using arbor press and a holding fixture. Install washers and nuts. Torque nuts to 0 in-lb (0 Nm). (d) Install inlet fitting and torque to 0-0 in-lb (. -.6 Nm). Note: Cap fittings if brake is not being immediately installed on the airplane. (e) (f) (g) (h) (i) Install bleeder seat, screw, and cap. Torque to 0-0 in-lb (. -.6 Nm). Serials 60 thru 0, 00 thru 600 after SBX--: Install friction springs on pistons. Install O-ring(s) on piston(s) and lubricate. Place piston(s) in cylinder bore(s) and verify piston(s) and O-ring(s) are in proper alignment Press piston(s) into cylinder bore(s) by hand. If required, tap the piston(s) squarely with a wooden or plastic mallet while rotating piston(s). Care should be exercised to prevent over tightening the inlet fitting which could result in cracking of cylinder casting. Finger tighten the inlet fitting, rotate one to two turns to obtain proper installation orientation, and torque to specified value. (j) Install pressure plate lining facing away from piston(s) by sliding over anchor bolts. Verify pressure plate slides freely over anchor bolts. (k) Serials thru 0, 00 thru after SBX--: Install brake temperature indicator. (Refer to ) () Installation - Brake Assembly (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Silicon Spray - Any Source Lubrication. (b) If torque plate installation is required: Orient and install torque plate on axle flange with bolts, nuts, and washers. Torque to 60-0 in-lb (8 - Nm). Install wheel assembly. (Refer to -) Note: Dry film lubricants such as silicone spray should be applied to anchor bolts and torque plate bushings to assist sliding motion. Exercise care to verify that linings do not become contaminated with fluid or lubricant. For best service life, cylinders must slide freely in torque plate. All Page 7 Dec 0
(c) (d) (e) (f) (g) (h) Carefully slide anchor bolts secured to cylinder assembly into torque plate bushings. Position back plate(s) between brake disk and wheel. Serials 00 thru 600 before SBX--: Install bolts and washers securing back plates to cylinder assembly. Torque to 7-80 in-lb (8. -. Nm). Serials 60 thru 0, 06 & subs w/o Perspective Avionics, 00 thru 600 after SB X--: Install bolts and washers securing back plates and shim to cylinder assembly. Torque to 0 in-lb (0. Nm). Serials 06 & subs w/ Perspective Avionics: Install bolts and washers securing back plates, shim, and temperature sensor to cylinder assembly. Torque to 0 in-lb (0. Nm). Uncap and attach hydraulic line to cylinder inlet fitting. (i) Bleed the system. (Refer to ) (j) Install main gear fairings. (Refer to -0) (k) Perform Adjustment/Test - Conditioning Procedure for Brake Linings. (Refer to ) () Inspection/Check - Brake Assembly (a) Serials 00 thru 00 before SBX-0-0: Inspect brake assembly. Disassemble brake assembly. (Refer to ) Perform Inspection/Check - Brake Linings. (Refer to ) Inspect brake cylinder bores for evidence of scoring and deterioration. If scored, replace brake caliper assembly. Using new O-rings, reassemble brake assembly. (Refer to ) (b) Serials 0 thru 0, 00 thru 00 after SBX-0-0: Inspect brake assembly. Perform Inspection/Check - Brake Linings. (Refer to ) Perform Inspection/Check - Brake Temperature Indicator. (Refer to ) Page 8 Dec 0 All
C. Brake Assembly - Serials 00 thru 0 after SBX--, & subs (See Figure ) () Removal - Brake Assembly Verify parking brake is in off position and wheels are blocked. (a) Remove main gear fairings. (Refer to -0) (b) Raise airplane on jacks. (Refer to 07-0) (c) Remove cotter pin from axle and remove axle nut. (Refer to -) (d) Cut and remove safety wire around brake disc. (e) Remove wheel/tire. (Refer to -) (f) Serials w/ Perspective Avionics: Remove brake temperature sensor. (Refer to ) (g) Remove inlet fitting, washers, and hydraulic line from brake cylinder. Cap hydraulic line and inlet on brake cylinder. (h) Remove bolts and washers securing brake assembly to axle. () Disassembly - Brake Assembly (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Plastic Dental Pick - Any Source Remove O-rings. Compressed Air Supply - Any Source Facilitate piston removal and cleaning. Dry Cleaning Solvent - Any Source Clean seal grooves. Cotton Cloth (clean and lint free) - Any Source Clean parts. (b) (c) Remove screws securing back plate to brake cylinder. Separate cylinder, brake pads, brake disc, and back plate. WARNING: Pistons will be ejected at high velocities. Care should be used in handling O-rings to prevent damage. Do not use metal tools to remove O-rings from pistons. Metal tools will scratch the seal groove and cause fluid leakage. Note: Air pressure can be used to remove pistons. Replace caliper back plate and blow air pressure into inlet on brake cylinder. (d) (e) (f) (g) Remove O-rings from pistons with a plastic dental pick. Remove bleeder screw from brake cylinder. Remove cotter pins securing back stops to brake pads. Remove back stops. Clean brake assembly. WARNING: Dry cleaning solvents are toxic and volatile. Use a well-ventilated room and avoid contact with skin and clothing. Do not inhale vapor. Serials 00 thru 0 after SBX--, & subs Page Dec 0
Do not use basic or acidic cleaning agents on wheel halves. Anodizing can be removed if exposed to basic agents. Do not damage ball bearing seal or expose to solvents. Clean all metal parts using water with soap and wipe dry with a clean cloth. Use dry cleaning solvent only on seal grooves. Clean seal grooves with a soft plastic brush and dry-cleaning solvent. Do not use oily solvent or oily air pressure on internal threads because threadlocker will not properly lock screws if exposed to oil. Ensure that no dust remains inside seal grooves. Apply air pressure to dry internal threads and seal grooves. (h) Remove brake temperature indicator. (Refer to ) () Reassembly - Brake Assembly Note: (a) Thoroughly clean parts before assembling. Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose O-Ring Lubricant Dow Corning O-Ring Lubricant Dow Chemical Co. Midland, Michigan 867 8-66-000 Lubrication. Silicone Grease, Thick (-0 C to 00 C) Compliant w/ FDA CFR 78.70 Any Source Lubrication. Loctite Threadlocker, Medium or Any Source Secure screws. (b) Perform Inspection/Check - Brake Assembly. (Refer to ) Do not use silicone spray (liquid) in place of thick silicone grease where specified. Do not use tools to manually insert seals or pistons into cylinder bores. Never re-use a piston seal that has been removed from a cylinder bore groove. (c) (d) (e) (f) (g) (h) Lubricate new seals with a thin coat of thick silicone grease. Lubricate cylinder bores with a thin coat of thick silicone grease. Insert seals into cylinder bore grooves by hand only. Lubricate piston cylinder with a thin coat of thick silicone grease. Insert pistons into cylinder bores by hand only. Verify pistons and O-rings are in proper alignment. Page 0 Dec 0 Serials 00 thru 0 after SBX--, & subs
If piston does not slide into cylinder bores with pressure of only one or two fingers, it is sticking which can lead to brake damage and overheating. Do not attempt to sand or polish pistons. If pistons are sticking, they must be replaced. Copper seals must be changed at each removal of the hydraulic fitting. (i) Insert new bleeder screw and change copper seals. (j) Using thick silicone grease, lubricate contact area between back stops and back plate. (k) Insert new cotter pins to secure back stops. (l) Install new brake pads. (m) Apply medium threadlocker to new screws used to secure back plate to cylinder. (n) Install screws securing brake pads in place. Torque to 0 in-lb ( Nm). (o) Re-torque all screws to 0 in-lb ( Nm). (p) Ensure brake pads slide without effort. (q) Position brake disc between brake pads. (r) Install brake temperature indicator. (Refer to ) () Installation - Brake Assembly (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Safety Wire, Stainless Steel 0.0 diameter wire (grade 0) Any Source Safetying brake disc to wheel. (b) Orient and install brake assembly on axle flange with bolts, nuts, and washers. Torque to 0 in-lb (. Nm). (c) Position wheel/tire onto axle while placing brake disc into wheel slots. (d) Install wheel/tire. (Refer to -) (e) Install safety wire securing brake disc to wheel. (Refer to 0-0) (f) Uncap hydraulic line and inlet on brake cylinder. (g) Install washers, hydraulic line, and inlet fitting to brake cylinder. Torque to 0 in-lb (.86 Nm). (h) Serials w/ Perspective Avionics: Install brake temperature sensor. (Refer to ) (i) Bleed the system. (Refer to ) (j) Remove jacks and lower airplane. (Refer to 07-0) (k) Install main gear fairings. (Refer to -0) Serials 00 thru 0 after SBX--, & subs Page Dec 0
() Inspection/Check - Brake Assembly (a) Visually inspect brake cylinder and back plate for cracks, nicks, corrosion, or other damage. (b) Ensure none of the following conditions exist. If damage is identified during inspection, brake cylinder and/or back plate must be replaced. Signs of deep corrosion, Anodizing color removed on more than % of external surface, Heavy nicks, Anodizing removed on internal piston bore, Scratched piston bore, and 6 Scratched or damaged seal groove. Anodizing coating must not be painted. Do not use sandpaper on any parts. Sandpaper will remove anodizing coating. Do not try to sand or polish internal piston bore, it will remove anodizing coating. (c) Verify brake disc wear limits are not exceeded. Refer to the manufacturer s approved Instructions For Continued Airworthiness for more information. (d) Perform Inspection/Check - Brake Pads. (Refer to ) (e) Perform Inspection/Check - Brake Temperature Indicator. (Refer to ) Page Dec 0 Serials 00 thru 0 after SBX--, & subs
D. Brake Linings - Serials 00 thru 0 before SBX-- (See Figure ) () Removal - Brake Linings (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Drill Bit - Serials 00 thru 600 before SBX-- /8-inch Any Source Rivet removal. (b) Remove brake assembly. (Refer to ) (c) Slide pressure plate over and off anchor pins secured to cylinder assembly. (d) Serials 00 thru 600 before SBX--: Remove rivets. Do not damage pressure plate during rivet removal. Using /8-inch drill bit, remove rivets attaching lining to pressure plate. Using /8-inch drill bit, remove rivets attaching lining to back plates. (e) Separate linings from pressure plate and back plates. (f) Clean pressure plate and back plate surfaces of dirt and grease. () Installation - Brake Linings (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Arbor Press - Serials 00 thru 600 before SBX-- - Any Source Rivet installation. Silicon Spray - Any Source Lubrication. (b) Inspect pressure plate and back plate(s) for excessive corrosion, visible damage, or excessive warping. Note: Pressure plates should not be used if warped in excess of 0.00 inch (0. mm) flatness. Excessive warping can result in brake drag especially when new disk and linings are installed. (c) (d) (e) Align new lining on pressure plate and back plates. Serials 00 thru 600 before SBX--: Install rivets. Using arbor press, secure lining to pressure plate. Using arbor press, secure lining to back plates. Verify linings are tight and movement free with no distortion of parts. Clean dirt, grease, etc. from cylinder, pressure plate, and portions of piston(s) extending beyond cylinder face. Push piston(s) back into cylinder. Note: Dry film lubricants such as silicone spray should be applied to anchor bolts and torque plate bushings to assist sliding motion. Exercise care to verify that linings do not become contaminated with fluid or lubricant. For best service life, cylinders must slide freely in torque plate. Serials 00 thru 0 before SBX-- Page Dec 0
(f) Install pressure plate with new lining(s) facing away from piston(s) by sliding over anchor bolts. Verify pressure plate slides freely over anchor bolts. (g) Install brake assembly. (Refer to ) () Adjustment/Test - Conditioning Procedure for Brake Linings This conditioning procedure will generate sufficient heat to create a thin layer of glazed material at the lining friction surface. Normal brake usage should generate enough heat to maintain the glaze throughout the life of the lining. Light brake usage can cause the glaze to wear off, resulting in reduced brake performance. In such cases, the lining may be conditioned again following the instructions below. (a) For organic brake linings: Taxi airplane for 00 feet with engine at 700 RPM applying brake pedal force as needed to develop a -0 MPH taxi speed. (b) Allow brakes to cool for 0- minutes. (c) Apply brakes and check to see if a high throttle static run up may be held with normal pedal force. If so, conditioning is completed. (d) If static run up cannot be held, repeat previous steps as needed to successfully complete test. () Inspection/Check - Brake Linings (a) Remove main gear fairing. (Refer to -0) (b) Serials 00 thru 600 before SBX--: Check brake lining for deterioration and maximum permissible wear. Replace lining when worn to 0.00 inch (. mm). (c) Serials 00 thru 600 after SBX--, 60 thru 0: Check brake lining for deterioration and maximum permissible wear. Replace lining when worn to 0.00 inch (0.76 mm). (d) Install main gear fairing. (Refer to -0) Page Dec 0 Serials 00 thru 0 before SBX--
E. Brake Pads - Serials 00 thru 0 after SBX--, & subs (See Figure ) () Removal - Brake Pads Verify parking brake is in off position and wheels are blocked. (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Cotton Cloth (clean and lint free) - Any Source Clean parts. (b) Remove main gear fairings. (Refer to -0) (c) Raise airplane on jacks. (Refer to 07-0) (d) Remove cotter pin from axle and remove axle nut. (Refer to -) (e) Cut and remove safety wire around brake disc. (f) Remove wheel/tire. (Refer to -) Note: While back plate is separated from cylinder, do not apply brake pressure. Do not remove caliper back plate from axle. Do not disconnect hydraulic fitting. Do not remove brake disc. Retain brake disc in place. (g) Remove screws securing back plate to brake cylinder. (h) Remove and discard brake pads. (i) Perform Inspection/Check - Brake Assembly. (Refer to ) Do not use solvent to clean pistons and surrounding area. Solvent will penetrate to and damage piston seals. Use only a dry cloth. (j) Clean around pistons with a dry cloth to remove dirt and dust. () Installation - Brake Pads Note: (a) Thoroughly clean parts before assembling. Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Loctite Threadlocker, Medium or Any Source Secure screws. Safety Wire, Stainless Steel 0.0 diameter wire (grade 0) Any Source Safetying brake disc to wheel. Serials 00 thru 0 after SBX--, & subs If pushing back pistons by hand is difficult, pistons and seals are sticking or may be blocked. Brake maintenance is required with change of seals and eventual change of other parts. Page Dec 0
(b) Push pistons back by hand. Never intermingle old and new brake pads. All four brake pads (two left and two right) must be replaced at the same time. Brake pad insulator and grid are part of new brake pads and should not be re-used. (c) Install new brake pads. (d) Apply medium threadlocker to screws used to secure back plate to cylinder. (e) Install screws securing brake pads in place. Torque to 0 in-lb ( Nm). (f) Re-torque all screws to 0 in-lb ( Nm). (g) Ensure brake pads slide without effort. (h) Position brake disc between brake pads. (i) Position wheel/tire onto axle while placing brake disc into wheel slots. (j) Install wheel/tire. (Refer to -) (k) Install safety wire securing brake disc to wheel. (Refer to 0-0) (l) Apply brake pressure -0 times anch check brake fluid level in the reservoir. When brakes are released, wheel should turn freely. (m) Verify brake efficiency and residual drag on the wheel. (n) Remove jacks and lower airplane. (Refer to 07-0) (o) Install main gear fairings. (Refer to -0) () Adjustment/Test - Conditioning Procedure for Brake Pads This conditioning procedure will wear off high spots and prepare brake pads and disc friction surfaces. A visual inspection of the brake disc will indicate the brake pads condition: a smooth surface with light and regular grooves indicates that brake pads and disc are properly conditioned. If rough surfaces on brake disc exist and/or reduced brake performance is noted, the brake pads and disc may be conditioned again following the instructions below. (a) Taxi airplane for 00 feet (00 m) with light brake effort. (b) Perform two () consecutive stop braking applications from 0 knots down to knots. Apply light brake effort during these two stops; do not try to apply full brake effort. (c) Allow brakes to cool for 0 to minutes. (d) Apply brakes and verify that high throttle static run up may be held with normal pedal force. If brakes hold, conditioning is completed. (e) If high throttle static run up cannot be held, repeat Adjustment/Test - Conditioning Procedure for Brake Pads as necessary to successfully complete test. Note: Improper conditioning may affect braking performance and increase wear of brake pads and disc. Rough surfaces (deep grooves and isolated bumps) on brake disc indicates that an excessive brake effort has been applied during conditioning. If rough surfaces exist, sand surface irregularities and repeat Adjustment/Test - Conditioning Procedure for Brake Pads. () Inspection/Check - Brake Pads (a) Remove main gear fairing. (Refer to -0) (b) Check brake pads for deterioration and maximum permissible wear. Replace brake pads when friction material is worn to 0.00 inch ( mm). (c) Install main gear fairing. (Refer to -0) Page 6 0 Jan 06 Serials 00 thru 0 after SBX--, & subs
F. Brake Temperature Indicator - Serials 00 thru after SBX--, & subs (See Figure ) () Removal - Brake Temperature Indicator (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Plastic Scraper - Any Source Remove indicator. Isopropyl Alcohol % or higher purity Any Source Clean. (b) Remove main gear fairing. (Refer to -0) (c) Using plastic scraper, remove temperature indicator from brake caliper assembly. (d) Using isopropyl alcohol, remove any remaining adhesive residue from brake caliper piston housing. (Refer to 0-0) () Installation - Brake Temperature Indicator (a) Clean dirt and oil from brake caliper piston housing. (b) Using isopropyl alcohol, solvent clean installation location on brake caliper piston housing and surrounding area. (Refer to 0-0) (c) Remove paper backing from temperature indicator, then press indicator firmly to installation location on brake caliper assembly. (d) Install main gear fairing. (Refer to -0) () Inspection/Check - Brake Temperature Indicator To provide a means of monitoring possible brake assembly overheating, two Brake Temperature Indicators are installed to the brake caliper piston housings. The bottom, blue indicator activates at 0 F and is inspected during each Preflight Inspection. The top, yellow indicator activates at 00 F and is inspected Annually. If either temperature indicator is black the brake assembly has overheated and O-ring(s) must be replaced. (a) Remove main gear fairing. (Refer to -0) (b) Wipe off any debris from brake caliper assembly that may obstruct inspection. (c) Locate temperature indicators installed on brake caliper assembly. (d) If both temperature indicators are white the brake assembly has not overheated. O-ring replacement is not necessary. Verify temperature indicators are firmly adhered to piston housing. (e) If either temperature indicator is black, the brake assembly has overheated and O-ring(s) must be replaced. Disassemble brake assembly. Remove and discard O-rings and temperature indicator. (Refer to ) Perform Inspection/Check - Brake Linings. (Refer to ) Reassemble brake assembly with new O-rings and temperature indicator. (Refer to ) Serials 00 thru after SBX--, & subs Page 7 Dec 0
A B C 7 8 Serials 00 thru after SB X--, Serials thru 600. 0 6 7 LEGEND. Bolt. Washer. Fitting. Cylinder. O-Ring 6. Piston 7. Rivet 8. Nut. Seat, Bleeder 0. Screw, Bleeder. Cap, Bleeder. Anchor Bolt. Torque Plate. Pressure Plate. Lining 6. Back Plate 7. Temperature Indicator (0 F/Blue) Serials 00 thru 600 before SBX-- and before SBX--. 6 NOTE If temperature indicator is black and/or shows signs of adhesion loss, replace the temperature indicator. SR0_MM_0H Figure Brake Assembly - Serials 00 thru 600 before SBX-- and before SBX-- ( of ) Page 8 Dec 0 Serials 00 thru 600 before SBX-- and before SBX--
8 6 6 8 7 NOTE If temperature indicator is black and/or shows signs of adhesion loss, replace the temperature indicator. Figure Brake Assembly - Serials 00-600 after SBX-- and before SBX--, Serials 60-0 before SBX-- ( of ) Serials 00-600 after SBX-- and before SBX--, Serials 60-0 before SBX-- 0 Serials 00 thru after SB X--, Serials thru 0. Serials 00 thru 00 after SB X-0-0, Serials 0 thru 0. Serials 00 thru 600 after SBX-- and before SBX--, Serials 60 thru 0 before SBX--. LEGEND. Bolt. Washer. Fitting. Cylinder. O-Ring 6. Piston 8. Nut. Seat, Bleeder 0. Screw, Bleeder. Cap, Bleeder. Anchor Bolt. Torque Plate. Pressure Plate. Lining 6. Back Plate 7. Temperature Indicator (0 F/Blue) 8. Temperature Indicator (00 F/Yellow) SR0_MM_8E Page Dec 0
C 6 C BRAKE LINE 0 6 NOTE 0 VIEW C If temperature indicator is black and/or shows signs of adhesion loss, replace the temperature indicator. DETAIL C LEGEND. Washer. Fitting. Cylinder 6. Piston 0. Screw, Bleeder 6. Back Plate. Screw 0. Back Stop. Cotter Pin. Brake Pad. Seal. Temperature Indicator (0 Red). Brake Disc Serials 00 thru 0 after SBX--, & subs. SR0_MM_6 Page 0 Dec 0 Figure Brake Assembly - Serials 00 thru 0 after SBX--, & subs ( of ) Serials 00 thru 0 after SBX--, & subs
G. Brake Temperature Sensor - Serials 06 & subs w/ Perspective Avionics (See Figure ) () Removal - Brake Temperature Sensor (a) Set BAT, BAT, and AVIONICS switches to OFF positions. (b) Pull ENG INST circuit breaker. (c) Remove main gear fairing. (Refer to -0) (d) Remove cable tie securing sensor connector to landing gear strut. (e) Disconnect electrical connector from sensor. (f) Serials 06 thru 0 before SBX--: Remove bolt and washers securing sensor to brake assembly. (g) Serials 06 thru 0 after SBX--, & subs: Remove nut and washer securing sensor to brake assembly. () Installation - Brake Temperature Sensor (a) Serials 06 thru 0 before SBX--: Position sensor to brake assembly and secure with bolt and washers. Torque bolts 8 to in-lb (.6 to 0.7 Nm). (b) Serials 06 thru 0 after SBX--, & subs: Position sensor to brake assembly and secure with nut and washer. Torque nut 0 to 70 in-lb (.6 to 7. Nm). (c) Connect electrical connector to sensor. (d) Install cable tie securing sensor connector to landing gear strut. (e) Install main gear fairing. (Refer to -0) (f) Reset ENG INST circuit breaker. () Inspection/Check Brake Temperature Sensor (a) Power on PFD and MFD in Configuration mode. While holding far right softkey on PFD and MFD, set BAT and AVIONICS switches to ON positions. When INITIALIZING SYSTEM appears in upper left corner of displays, release softkeys. (b) On PFD, use outer [FMS] knob to select GEA page. (c) On PFD, use inner [FMS] knob to select GEA STATUS page. (d) Press [ANLG IN] softkey. (e) Verify brake temp left and brake temp right status boxes are green. Serials 06 & subs w/ Perspective Avionics Page Dec 0
A B MAIN LANDING GEAR STRUT 6 BRAKE ASSEMBLY DETAIL A LEGEND. Brake Temperature Sensor. Bolt. Washer. Connector. Cable Tie Anchor 6. Cable Tie Serials 06 thru 0 w/ Perspective Avionics before SBX--. SR0_MM_70B Figure Brake Temperature Sensor - Serials 06 thru 0 w/ Perspective Avionics before SBX-- (Sheet of ) Page Dec 0 Serials 06 thru 0 w/ Perspective Avionics before SBX--
MAIN LANDING GEAR STRUT 7 6 BRAKE ASSEMBLY DETAIL B LEGEND. Brake Temperature Sensor. Washer. Connector. Cable Tie Anchor 6. Cable Tie 7. Nut Serials 06 thru 0 after SBX--, & subs. SR0_MM_60 Figure Brake Temperature Sensor - Serials 06 thru 0 after SBX--, & subs (Sheet of ) Serials 06 thru 0 after SBX--, & subs Page Dec 0
H. Strut Assembly Brake Line - Serials 00 thru 88 (See Figure ) () Removal - Strut Assembly Brake Line (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Plastic Dead Blow Hammer 60A McMaster Carr Strut removal. Plastic Wedge 868A McMaster Carr Strut removal. Heat Gun - Any Source Epoxy removal. (b) Remove main gear fairing. (Refer to -0) (c) Raise airplane on jacks. (Refer to 07-0) (d) Cut and remove tie down securing brake line to lower strut. (e) Loosen breeze clamp securing braided grounding strap to brake line. (f) Disconnect and cap flexible brake line at upper end of strut. (g) Disconnect brake line fitting from support bracket at upper end of strut. (h) Disconnect flexible brake line at lower end of strut. (i) Remove nuts and washers securing strut clamp to canted rib. (j) Using the dead blow hammer, squarely strike upper side of strut near clamp fitting to move strut down and away from clamp fitting. (k) Insert and drive plastic wedge into gap between clamp and fitting to free strut from clamp. (l) Slide grommet down strut to brake assembly. WARNING: Verify no fuel leaks or fuel residue are present before applying heat to strut. The adhesive securing the brake line to the strut does not require a high degree of heat to disbond. Heat the adhesive to the point where it is slightly hot to the touch. Do not exceed 0 F (66 C). To protect the composite wing skin from heat damage, place a barrier on the wing skin such as a welding blanket, high temperature mat, or damp cloth before applying heat to the upper section of the strut near the wing skin. (m) Apply heat to epoxy bonding brake line to strut channel. As epoxy heats and softens, pull brake line free from strut channel. Discard brake line. () Installation - Strut Assembly Brake Line (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Putty Knife - Any Source Epoxy removal. Sandpaper 80 Grit Any Source Remove epoxy. Minute Epoxy - Any Source Secure brake line. Do not use power tools to remove epoxy. Page Dec 0 Serials 00 thru 88
Do not cut or gouge strut laminate when removing epoxy. (b) (c) (d) (e) (f) (g) Using a putty knife and sandpaper, remove epoxy from strut channel. Mark the position where the lower fitting on the newly installed brake line should be positioned: At bottom, aft edge of strut, measure 8. inches (.6 cm) up and make a perpendicular reference line across strut face with pencil. Test fit new brake line: Place new brake line into upper support bracket and position to strut assembly. At top of strut where brake line enters strut channel and down approximately 6.0 inches (. cm), verify brake line fits completely into strut channel so that top radius of brake line is flush with top of strut channel. Verify flare on lower section of brake line aligns with reference mark on strut. Solvent clean strut channel with isopropyl alcohol. Solvent clean brake line with isopropyl alcohol. Mix approximately. grams of epoxy. Place a drop cloth over wheel assembly to protect assembly from dripping epoxy. Serials 00 thru 88 (h) Using wooden applicator, fill strut channel with epoxy until epoxy is flush with top of strut channel. (i) Install new brake line: Position brake line into upper support bracket, insert brake line into strut channel, and position brake line so flare on lower section of brake line aligns with reference mark on strut. Firmly press brake line into strut channel. At top of strut where brake line enters strut channel and down approximately 6.0 inches (. cm), seat brake line completely into strut channel so that top radius of brake line is flush with top of strut channel. Use a wooden applicator to spread epoxy over brake line Where brake line enters and exits strut channel, use a wooden applicator to spread epoxy over and around brake line. Wet a clean, lint free cotton cloth in isopropyl alcohol and clean up epoxy. Leave a thin coat of epoxy over top of brake line. 6 Apply down pressure over brake line by applying tape over brake line at lower fitting and over bend on upper section of brake line. (See Figure 0, Note ) 7 Allow epoxy to cure for hours. (j) Slide grommet up strut to canted rib strut fitting. (k) Move strut assembly up and towards strut fitting. (l) Position clamp fitting over grommet and install washers and nuts securing clamp fitting to canted rib fitting. Torque to 0.0 in-lb (6. Nm). (m) Connect flexible brake line at lower end of strut. (n) Connect brake line fitting to support bracket at upper end of strut. (o) Connect flexible brake line at upper end of strut. (p) Position breeze clamp around braided grounding strap and fasten to brake line. (q) Install tie down securing brake line to lower strut. (r) Remove jacks and lower airplane. (Refer to 07-0) (s) Final torque bolts securing strut(s) to canted rib(s) to 60.0-0.0 in-lb (8.-. Nm) (t) Fill brake system. (Refer to -0) Page Dec 0
(u) Bleed brake system. (Refer to ) (v) Verify strut stand-off used to secure lower strut fairing to strut is installed and securely attached. (w) Install main gear fairings. (Refer to -0) Page 6 Dec 0 Serials 00 thru 88
GROUNDING STRAP UPPER SUPPORT BRACKET BREEZE CLAMP 6.0" FLEXIBLE FUEL LINE STRUT CHANNEL TIEDOWN STRUT CLAMP FLEXIBLE FUEL LINE 8." REFERENCE LINE STRUT GROMMET NOTE At top of strut where brake line enters strut channel and down approximately 6.0 inches (. cm), verify brake line fits completely into strut channel so that top radius of brake line is flush with top of strut channel. At bottom, aft edge of strut, measure 8. inches (.6 cm) up and make a perpendicular reference line across strut face with pencil. Apply down pressure over brake line by applying tape over brake line at lower fitting and over bend on upper section of brake line. Verify stand off is installed and securely attached. Serials 00 thru 877, 87 thru 88. SR0_MM_86A Serials 00 thru 88 Figure Strut Assembly Brake Line - Serials 00 thru 88 Page 7 Dec 0
I. Strut Assembly Brake Line - Serials 886 & subs (See Figure ) () Removal - Strut Assembly Brake Line (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Plastic Dead Blow Hammer 60A McMaster Carr Strut removal. Plastic Wedge 868A McMaster Carr Strut removal. Heat Gun - Any Source Epoxy removal. (b) Remove main gear fairing. (Refer to -0) (c) Raise airplane on jacks. (Refer to 07-0) (d) Remove tie down securing brake line to lower strut. (e) Remove tie down securing braided grounding strap to brake line. (f) Remove bolt, washers, and nut securing lightning protection wire to lateral wing rib. (g) Disconnect and cap brake line at strut upper end. (h) At strut upper end, remove bolt, washer, and clamp securing brake line to bracket. (i) Disconnect and cap brake line at strut lower end. (j) Remove nuts, washers, bolts, and clamp securing strut assembly to lower attach fitting. When removing strut from lower attach bracket, use caution to prevent damaging upper strut fitting and upper attach bracket. (k) (l) If necessary, gently tap upper side of strut with a dead blow hammer to move strut away from lower attach fitting. Slide grommet down strut to brake assembly. WARNING: Verify no fuel leaks or fuel residue are present before applying heat to strut. The adhesive securing the brake line to the strut does not require a high degree of heat to dis-bond. Heat the adhesive to the point where it is slightly hot to the touch. Do not exceed 0 F (66 C). To protect the composite wing skin from heat damage, place a barrier on the wing skin such as a welding blanket, high temperature mat, or damp cloth before applying heat to the upper section of the strut near the wing skin. (m) Apply heat to epoxy bonding brake line to strut channel. As epoxy heats and softens, pull brake line free from strut channel. Discard brake line. () Installation - Strut Assembly Brake Line (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Putty Knife - Any Source Epoxy removal. Sandpaper 80 Grit Any Source Remove epoxy. Page 8 Dec 0 Minute Epoxy - Any Source Secure brake line. Serials 886 & subs
Do not use power tools to remove epoxy. Do not cut or gouge strut laminate when removing epoxy. (b) (c) (d) (e) (f) (g) Using a putty knife and sandpaper, remove epoxy from strut channel. Mark position where lower fitting on newly installed brake line should be positioned. At bottom, aft edge of strut, measure 8.6 inches (.8 cm) up and make a perpendicular reference line across strut face with pencil. Test fit new brake line. Align flare on lower section of brake line with reference mark on strut. At top of strut where brake line enters strut channel and down approximately 6.0 inches (. cm), verify brake line fits completely into strut channel so that top radius of brake line is flush with top of strut channel. Solvent clean strut channel with isopropyl alcohol. Solvent clean brake line with isopropyl alcohol. Mix approximately. grams of epoxy. Place a drop cloth over wheel assembly to protect assembly from dripping epoxy. Serials 886 & subs (h) Using wooden applicator, fill strut channel with epoxy until epoxy is flush with top of strut channel. (i) Install new brake line. Insert brake line into strut channel, and position brake line so flare on lower section of brake line aligns with reference mark on strut. Firmly press brake line into strut channel. At top of strut where brake line enters strut channel and down approximately 6.0 inches (. cm), seat brake line completely into strut channel so that top radius of brake line is flush with top of strut channel. Use a wooden applicator to spread epoxy over brake line. Where brake line enters and exits strut channel, use a wooden applicator to spread epoxy over and around brake line. Wet a clean, lint free cotton cloth in isopropyl alcohol and clean up epoxy. Leave a thin coat of epoxy over top of brake line. 6 Apply down pressure over brake line by applying tape over brake line at lower fitting and over bend on upper section of brake line. (See Figure 0, Note ) 7 Allow epoxy to cure for hours. (j) Slide grommet up strut to lower attach fitting. (k) Move strut assembly up and towards lower attach fitting. (l) Position clamp to lower attach fitting and secure with bolts, washers, and nuts. (m) Connect brake line at strut lower end. (n) At strut upper end, position brake line to bracket and secure with bolt, washer, and clamp. (o) Connect brake line at strut upper end. (p) Position lightning protection wire to lateral wing rib and secure with bolt, washers, and nut. (q) Position braided grounding strap to brake line and secure with cable tie. (r) Install cable tie securing brake line to lower strut. (s) Remove jacks and lower airplane. (Refer to 07-0) (t) Fill brake system. (Refer to -0) (u) Bleed brake system. (Refer to ) (v) Install main gear fairings. (Refer to -0) Page Dec 0
UPPER SUPPORT BRACKET 6.0 inches (. cm) STRUT CHANNEL CABLE TIE FLEXIBLE BRAKE LINE 8.6 inches (.8 cm) REFERENCE LINE STRUT GROMMET NOTE At top of strut where brake line enters strut channel and down approximately 6.0 inches (. cm), verify brake line fits completely into strut channel so that top radius of brake line is flush with top of strut channel. At bottom, aft edge of strut, measure 8.6 inches (.8 cm) up and make a perpendicular reference line across strut face with pencil. Apply down pressure over brake line by applying tape over brake line at lower fitting and over bend on upper section of brake line. SR0_MM_6 Page 0 Dec 0 Figure Strut Assembly Brake Line - Serials 886 & subs Serials 886 & subs
J. Brake Master Cylinder (See Figure ) () Removal - Brake Master Cylinder (a) Drain hydraulic fluid from brake system. (b) Remove cotter pins and washers from rudder pedal pivot tubes. (c) Slide rudder pedal pivot tube from bearing. (d) Detach rudder pedals from torque tube weldment. (e) Serials 00 thru 0 before SBX--: Disconnect hoses from master cylinders. Cap or plug ports and hoses. (f) Serials 00 thru 0 after SBX--, & subs: Remove bolts and washers securing brake line hoses from master cylinders. Cap or plug ports and hoses. (g) Remove cotter pins, washers, and clevis pins from upper connection at rudder pedals of each master cylinder. (h) Pull rudder pedal aft and remove cotter pins, washers, spacers (if installed), and clevis pins at floorboard mounting points and remove master cylinder. () Installation - Brake Master Cylinder (a) Place master cylinders on floorboard mounting points, install clevis pins, and secure with washers, spacers (if installed), and cotter pins. (b) Serials 00 thru 0 before SBX--: Connect brake hoses to master cylinders. Upper port is inlet, lower port is outlet. (c) Serials 00 thru 0 after SBX--, & subs: Install bolts and new washers securing brake hoses to master cylinders. Upper port is inlet, lower port is outlet. Torque to 8 in-lb (6.7 Nm). (d) Connect piston rod clevis to upper connection at rudder pedals and install washers, clevis pins, and cotter pins. (e) Place rudder pedals in proper alignment with torque tube weldment and install rudder pedal pivot tubes, washers, and cotter pins. All Page Dec 0
K. Parking Brake Valve (See Figure 6) () Removal - Parking Brake Valve (a) With parking brake knob in OFF position, drain hydraulic fluid from brake system. (b) Remove LH crew seat. (Refer to -0) (c) Remove LH kick plate. (Refer to -0) (d) Serials 00 thru 0 before SBX--: Disconnect brake lines and hoses from parking brake valve. Cap or plug ports, lines, and hoses. (e) Serials 00 thru 0 after SBX--, & subs: Disconnect brake lines and hoses. Disconnect brake lines from parking brake valve. Cap or plug ports and lines. Remove bolts and washers securing master cylinder hoses from parking brake valve. Cap or plug ports and hoses. (f) Remove cotter pin, washers, and clevis pin securing control cable to parking brake valve actuation arm. (g) Remove bolts, washers, and nuts securing parking brake valve to outboard console rib. Remove parking brake valve from airplane. () Installation - Parking Brake Valve (a) Position parking brake valve to outboard console rib with actuation arm adjacent to firewall and brake line fittings oriented towards fuselage floor. Secure with bolts, washers, and nuts. (b) Remove caps from ports, lines, and hoses. (c) Connect LH brake line to forward inlet on parking brake valve. (d) Connect RH brake line to aft inlet on parking brake valve. Do not cross LH and RH brake hoses. (e) Serials 00 thru 0 before SBX--: Connect master cylinder brake hoses. Connect brake hose from LH master cylinders to forward outlet on parking brake valve. Connect brake hose from RH master cylinders to aft outlet on parking brake valve. (f) Serials 00 thru 0 after SBX--, & subs: Connect master cylinder brake hoses. Install bolts and new washers securing LH master cylinders brake hose to forward outlet on parking brake valve. Torque to 8 in-lb (6.7 Nm). Install bolts and new washers securing RH master cylinders brake hose to aft outlet on parking brake valve. Torque to 8 in-lb (6.7 Nm). (g) Install clevis pin, washers, and cotter pin securing control cable to parking brake valve actuation arm. (h) Perform Inspection/Check - Parking Brake Control Cable. (Refer to ) (i) Perform Adjustment/Test - Bleeding the Brake System.(Refer to ) (j) Install LH kick plate. (Refer to -0) (k) Install LH crew seat. (Refer to -0) Page Dec 0 All