76 Crs 38 Crs Section on A-A ø30. MU-2 Brake Caliper. Caliper with Tension Spring Part No Weight (caliper only) kg.

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1 MU (Mk ) Series Disc Brake Caliper DB00 M0 Mounting Bolt Grade Tighten to Nm ( lbf-ft). A A 0 Crs Crs Section on A-A ø0 MU- Brake Caliper Caliper with Tension Spring Part No. 0. Weight (caliper only)- 0.0 kg. Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Tension Spring 000 Grooved Pin 000 Brake Pad 000 General Description The I M U series of disc brake calipers is the smallest in the Twiflex range and is designed for light duty stopping and holding applications. The range consists of three spring aplied, air released brake calipers type MUS, MUS and MUS; one handwheel adjustable spring applied, brake caliper type M U H; one air applied, spring released disc brake caliper type MU and one direct air applied brake caliper type MUP. This range of brakes is normally used with mm thick discs having a minimum dia. of 0mm, (these are not available from the standard Twiflex range), but the M US caliper will accommodate discs up to mm thick. With a revised thruster mounting arrangement (see page ) them US and M U calipers can be used with standard~twiflex discs.mm ( ) thick. TheM US disc brake caliper, the smallest in the spring applied series, has a spring loaded piston type thruster: The MUS disc brake caliper, the next in the series, is intended mainly for light holding duties (or for very occasional stopping applications). It has a diaphragm type thruster. No adjustment for brake pad wear is provided. TheM US caliper is similar to the US but has a heavier spring. This brake is used for normal stopping and holding duties. Both the MUS and MUS calipers have an adjusting screw in the push rod which allows the braking force to be maintained, provided regular adjustments are made to compensate for brake pad wear. The maximum air pressure to be used with these calipers is bar (00 psi).

2 Disc Brake Caliper: Type MUS - Spring Applied, Air Released Light duty, stopping and holding. to 0 to 0 0 Dimension X see Note X 0 G / [/ BSP] 0 0 to Edge of Disc Use M0 Grade Mounting Bolt Tightening Torque Nm ( lbf-ft) Brake Disc Disc Brake Caliper Assembly Ype MUS Note: Set dimension X to mm with brake ON. This setting corresponds to maximum Braking Force setting. Readjust setscrew (item ) when dimension X exceeds 0mm. To avoid damage to thruster diaphragm do not turn the Piston Rod while adjusting the setscrew. Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Tension Spring 000 Grooved Pin 000 Brake Pad Cylinder Piston End Cover 0 Compression Spring 00 O-Ring 000 O-Ring 000 Spacer 0 M Adjusting Screw 000 M Full Nut 00 Internal Circlip / BSP Nut 000 Technical Data MUS: Thruster only Part No. 0(S). Caliper only Part No. 0. Complete assembly (Caliper and thruster) Part No. 0. Weight (complete assembly)-,0kg Minimum brake disc diameter- 0mm Disc thickness (Standard) - mm New pad dimensions- 0x0xmm thick Brake pad wear allowance - mm each pad Total pad area - 0cm Minimum pressure for full retraction -. bar ( psi). Maximum pressure- bar (00 psi) Braking Force 00 N (bf) at coefficientof friction m = 0. (Effective disc radius (m) = actual radius (m)- 0.00).

3 Disc Brake Caliper: Type MUS - Spring Applied, Air Released Holding Duties and Occasional Stopping to to G / [/ BSP] 0 0 To Edge of Disc Brake Disc (See Text) Use M0 Grade Tight Torque Nm ( lbf-ft) 0 Disc Brake Caliper Assembly Type MUS Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Tension Spring 000 Grooved Pin 000 Brake Pad Front Cap 0 Rear Cap 0 Diaphragn 00 Thruster Spring Cap 00 Piston Rod Piston Rod Plate 0 Spacer 0 Comression Spring 000 O-Ring 0000 Quad Seal Pressure Washer 00 Mx Skt Hd Cap Screw 00 M Light Washer 00 / BSP Nut 00 M Nut 00 Mx Skt Hd Cap Screw 00 Technical Data MUS: Thruster only Part No. 0(S). Caliper only Part No. 0. Complete assembly (Caliper and thruster) Part No. 0. Weight (complete assembly)-,0kg Minimum brake disc diameter- 0mm Disc thickness (Standard) - mm New pad dimensions- 0x0xmm thick Brake pad wear allowance - mm each pad Total pad area - 0cm Minimum pressure for full retraction -. bar ( psi). Maximum pressure- bar (00 psi) 0 *If one of the mounting spacers (Item ) is repositioned between thruster and caliper, thicker discs up to mm can be accommodated. (see scrap view). Braking Force 00 N (bf) at coefficientof friction m = 0. (Effective disc radius (m) = actual radius (m)- 0.00).

4 Disc Brake Caliper: Type MUS - Spring Applied, Air Released Stopping and Holding Duties to to G / [/ BSP] 0 0 X To Edge of Disc Use M0 Grade Tight Torque Nm ( lbf-ft) Brake Disc 0 Disc Brake Caliper Assembly Type MUS Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Tension Spring 000 Grooved Pin 000 Brake Pad Front Cap 0 Rear Cap 0 Diaphragn 00 Thruster Spring Cap 00 Piston Rod 0 Piston Rod Plate 0 Spacer 0 Comression Spring 000 O-Ring 0000 Quad Seal Pressure Washer 00 Mx Skt Hd Cap Screw 00 M Light Washer 00 / BSP Nut 00 M Nut 00 Mx Skt Hd Cap Screw 00 M0x0 Hex Hd Screw 00 M0 Full Nut 00 Technical Data MUS: Thruster only Part No. 0(S). Caliper only Part No. 0. Complete assembly (Caliper and thruster) Part No. 0. Weight (complete assembly)-.0kg Minimum brake disc diameter- 0mm Disc thickness (Standard) - mm New pad dimensions- 0x0xmm thick Brake pad wear allowance - mm each pad Total pad area - 0cm Minimum pressure for full retraction -. bar (0 psi). Maximum pressure- bar (00 psi) Braking Force 00 N (bf) at coefficientof friction m = 0. (Effective disc radius (m) = actual radius (m)- 0.00).

5 Disc Brake Caliper: Type MUH - Hand Operated, Spring Applied Handwheel Adjustable 0 to to Edge of Disc 0 Use M0 Grade Tightening Torque Nm ( lbf-ft) Brake Disc Disc Brake Caliper Assembly Type MUH Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Tension Spring 000 Grooved Pin 000 Brake Pad Hand Knob 00 Sleeve 0 Push Rod 0 Spring 000 / BSP Nut 00 Spacer 0 Technical Data MUS: Hand Knob Assembly only Part No. 00. CaJiper only Part No. 0. Complete assembly (Caliper and hand knob assembly) Part No. 0. Weight(complete assembly) -.0kg Minimum brake disc diameter- 0mm Disc thickness (Standard) -:- mm. New pad dimensions..::.:.. 0x0xmm thick Brake pad wear allowance - mm each pad maximum Total pad area - 0cm Braking Force 0 N ( lbf) at coefficientof friction m = 0. (Effective disc radius (m) = actual radius (m)- 0.00).

6 Disc Brake Caliper: Type MU - Air Applied, Spring Released to 0 to 0 G / [/ BSP] 0 To Edge of Disc Brake Disc (See Text) Use M0 Grade Tight Torque Nm ( lbf-ft) 0 Disc Brake Caliper Assembly Type MU Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Tension Spring 000 Grooved Pin 000 Brake Pad Front Cap 0 Rear Cap 000 Diaphragn 00 Comression Spring 0000 / BSP Nut 000 Pistion Rod Assembly 0 Spacer 0 Mx Skt Hd Cap Screw 00 M Nut 00 0 Technical Data MUS: Thruster only Part No. 0. Caliper only Par;t No: 0. Complete brake-assembly Part No. 0. Weight (complete assembly)-.00kg Minimum brake disc diameter- 0mm Disc thickness (Standard) - mm New pad dimensions- 0x0xmm thick Brake pad wear allowance - mm each pad Total pad area - 0cm Maximum pres$tlre - bar ( psi) Volume displacement of thruster at mm stroke- ml Max. volume displacement at 0mm stroke- 0 ml Disc Diameter mm Maximum Pressure bar Nm = 0 lbf-ft bar = psi Braking Torque Nm The above Braking Torque graph for Type MU Brake is for bedded and conditioned brake pads having a coefficient of friction of 0. when used with Standard Twiflex brake disc materials. Air Pressure - bar Braking Force 00 N (bf) at coefficientof friction m = 0. (Effective disc radius (m) = actual radius (m)- 0.00).

7 Disc Brake Caliper: Type MUP - Air Applied to 0 to Edge of Disc G / [/ BSP] Use M0 Grade Tightening Torque Nm ( lbf-ft) Brake Disc Disc Brake Caliper Assembly Type MUP Complete assembly (Caliper and thruster) Part No. Arm (Thruster Side) 0 Arm (Opposite Side) 0 Pivot Post 00 Pad Retaining Spring 00 / Plain Washer 000 M0 Plain Washer 000 Air Thruster 00 / x/ Rivet 00 0 Technical Data MUP: Complete assembly (Caliper and thruster) Part No. 0. Weight (complete assembly) kg Minimum brake disc diameter -0mm Disc thickness (Standard) - mm New pad dimensions- 0x0xmm thick Brake pad wear allowance - mm each pad Total pad area - 0cm Maximum pressure- bar (00 psi) Volume displacement of thruster at maximum (mm) stroke-. ml Air Pressure - bar Disc Diameter mm Maximum Pressure bar Nm = 0 lbf-ft bar = psi Braking Torque Nm Brake Performance of MUP Disc Brake Caliper The ratings shown on the above graph are based on fully bedded-in pads and coefficient of friction of 0. Braking Force bar ( 00 psi) = 0 N (: I bf) Brake torque (Nm) = Braking force (N)xeffective disc radius (m). (Effective disc radius (m) = actual radius (m)- 0.00).

8 Continued from page The M UH disc brake caliper is fitted with a large.plastic hand knob for adjustment of the spring thrust and provides an economic and effective brake for light holding duties or as a tensioning brake where hand setting ~ can give an adequate braking control. The thrust force and consequently the braking force can be varied from zero to 0 N at maximum setting at coefficient of friction I = 0.. The braking force of 0 N holds for pad wear up to mm but declines to 0 N at mm pad wear each pad. The MU is a pneumatically applied, spring released disc brakecaliperfitted with a diaphragm type thruster. The braking force available from this caliper decreases slowly from the value in the table (which is for new pads) to 0 N at mm stroke, equivalent to.mm wear per pad. Beyond this point the fall oft of braking force is more rapid. The disc brake caliper, type M UP, is the smallest in the Twiflex range. It is a simple air operated direct acting unit without return spring and is supplied fully assembled. Performance of Type MU (Mk ) Disc Brakes: Brake Type Maximum Braking Force Minimum Pressure for Full Retraction MUS 00 N (bf). bar ( psi) MUS 0 N ( lbf) bar ( psi) MUS 00 N ( lbf). bar (0 psi) MUH 0 N (bf) - MU 0 N ( lbf) - MUP 0 N ( lbf) - Installation: Thrustersshouldbeattachedtothecaliperarmusingthespacersandnutsprovided,asshowninthedrawings on pages to. The maximum tightening torque is 0 Nm ( lbf-ft). If possible the calipers should be operated using dry, filtered and non-lubricated air. Discs: The preferred material for the manufacture of discs is spheroidal graphite cast iron. Grey iron can be used, but the maximum speed is reduced by one-third. Forged or wrought (not cast) steel having a hardness of 00 HB minimum may also be used. Disc rubbing paths should have a surface finish of m CLA or better, and be flat and parallel within O.OSmm. A range of standard discs of.mm thickness is available from Twiflex (Data Sheet DB00) which may be used with MUS and M U brake calipers. Twiflex discs are manufactured to the above limits from spheroidal graphite iron to BS grade 0/. Selection of Type MU (Mk ) Disc Brakes: Type Caliper Thruster Complete Part No. Part No. Brake Part No. Characteristics and Applications MUS Spring Applied - air released Light duty, stopping and holding MUS Spring applied - air released Holding duties and occasional stopping MUS Spring applied - air released Light duty, stopping and holding MUH Hand operated Holding duties only MU Air applied - spring released Holding and stopping duties MUP Air applied 0* Light duty, holding duties only * Thruster 0 = Thruster 00 plus Fixing RIvets. Briar Road, Twickenham Middlesex TW RB - England + (0) 0 Fax: + (0) 0 0 This approval is in Accordance with Certificate number 0 Issue 0 June 00 Twiflex 00. DB00 / Printed in USA