Reduced Stopping Distance: Why the Mandate? According to the Federal Motor Carrier Safety Administration (FMCSA): Overall the fatality rate for large truck crashes was 66 percent higher than passenger vehicles (2005) When the FMCSA report considered tractor and trailer combinations separately, the crash fatality rate was nearly 100% higher than for passenger vehicles. Conversely, the crash fatality rate for single-unit trucks was approximately 23 percent higher than for passenger vehicles The FMCSA data indicates that for all types of crashes involving large trucks, those involving trucks with a GVWR over 26,000 pounds (Class 7) have the highest rate of crash involvement Once all subject heavy truck tractors on the road are equipped with enhanced braking systems, we estimate that annually, approximately 227 lives will be saved and 300 serious injuries will be prevented. In addition, this final rule is expected to prevent over $169 million in property damage annually, an amount which alone is expected to exceed the total cost of the rule.
Created the opportunity to improve safety, save lives and avoid property damage. You! Can make certain this mandate achieves its targets thru proper maintenance and part selection. All the safety improvements created by RSD can be undone by selecting a noncompliant friction when maintaining and RSD vehicle
Stopping Distances Air Disc Required? Product enhancements have reduced the gap between air drum and air disc brake performance
Friction Material Regulations FMVSS-121 Regulations National Highway Traffic Safety Administration (NHTSA) requires: Requires that vehicles meet the following stopping distances from 60 mph : This is an OEM Brake requirement however, fleets should make sure that any friction material used is certified to pass FMVSS-121 requirements
RSD Phase II Impacted Vehicle Configurations 4x2 Tractors 6x2 Tractors 6x4 (heavy) Tractors 6x4 Tractors w/ Pusher(s) Tridem Tractors Tridem Tractors w/ Pusher(s) Twin-Steer Tandem-Drive Tractor Twin-Steer Tridem-Drive Tractor ~2% of overall build ~6% of overall build ~4% of overall build ~3% of overall build <1% of overall build <1 % of overall build <1% of overall build <1% of overall build ~15% of build Note: Volumes based on historical build figures
RSD Phase II Program Highlights Air Disc Brake Solutions Expanded use of the higher output Air Disc Brakes for heavy tractors requirements Foundation Drum Brakes New Structurally Reinforced S-shoe for Drum Brakes Expanded Use of the High Performance ES Drum Brake Introducing New High Performance Friction Materials Significant vehicle testing for brake compatibility and wear balance Air Disc Comparison Reinforced S Shoe High Output ADB Traditional ADB
Brake Balance Comparison Torque curve of RSD lining is comparable to previous lining mixes so as not to upset the tractor to trailer brake balance.
What change did RSD make to the tractor? Most tractor OE s doubled the braking torque of the front brakes to meet the new stopping distance requirement. - Front brake spiders have been made heavier. - Brake spider mounting bolts are a larger diameter. - Most new front brakes are 16.5 diameter X 5 wide. - Front brakes now use size 24 brake chambers, increasing the AL factor to 132. 24 X 5.5 = 132
Why the RSD Drum Brakes Perform Better 60 MPH 90 PSI Dynamometer Performance Comparison Typical Pre-RSD Brake Friction New RSD Brake Friction In-Stop Fade Reduced Fade & Higher Avg. Torque Significant reduction in In-stop Fade
RSD Phase I: Q Plus Configurations by OEM OEM Axle GAWR F: 15x4 R: 16.5x7 F: 15x5 R: 16.5x7 F: 16.5x5 R: 16.5x7 F: 16.5x5 R: 16.5x8.625 F: 16.5x6 R: 16.5x8.625 Navistar DTNA Volvo / Mack PACCAR 12.35k / 34k Std Avail. Avail. 12.5k / 40k Std. Avail. 14.6k / 40k Std. 12k / 40k Std. 14.6k / 46k Std. 12.5k / 40k Std. Avail. Avail. 14.6k / 46k Std. 13.2k / 38k Std. Avail. 13.2k / 40k Std. 14.6k / 46k Std. Different OEMs taking different approaches 16.5x7 rear brakes will still be available for some axle configurations at all OEMs except DTNA 15 front brakes will be available at both Volvo and Navistar (12.35k / 34k GAWR) A variety of options will be available to meet your fleet needs
13 RSD vs Std Friction Comparison
Safety Warning Label (Sept. 2013 Production) Safety Warning Label Placement on the Shoe & Lining Assemblies Safety Warning Label 1
Product Information Letter 1
Summary The Industry has successfully met the challenge of the Reduced Stopping Distance mandate with effective, affordable solutions which have had little to no negative impact on fleet operations Most drivers will not notice the change in day to day operations Selection of service parts are more critical than ever and have a greater impact on safety than before the Mandate Please consult your brake or vehicle manufacturer whenever you have questions we are here to help! 21 Bendix Commercial Vehicle Systems LLC All Rights Reserved Bendix