13 New Regulations RSD - Reduced Stopping Distance In an effort to significantly reduce road fatalities involving commercial vehicles, the NHTSA has instituted regulations to reduce FMVSS121 stopping distances from 60 mph for commercial vehicles closer to those of the other road vehicles. Implementation of the new regulations began with 2012 models effecting only new class 8 tractors. The new ruling repesents a reduction of 30% in stopping distance. The graph below explains the old versus new stopping distances for various vehicle axles, unloaded and loaded vehicles. Brake friction material plays a vital role in achieving the new stopping distance. Half of the reduction comes from increased friction output while the other half comes from the steer axle change from 15 x 4 in QP brake to 16.5 x 5 in QP (chamber from type 20 to 24). Drive axle brake will remain 16.5 x 7 in QP or move to 16.5 x 8-5/8 in QP. In other words, half of the reduction will come from the brake and chamber size change in the steer axle and the other half from increase in friction output. Requirement for RSD Materials Currently there are NO Federal Motor Carrier Safety Regulations governing aftermarket friction materials or performance requirements. End users are not required to verify their vehicles meet the new stopping distance requirements. If you’re looking to stay fully RSD compliant while maximizing stopping performance, we have the right solutions for you. Our premium aftermarket MaxHD H20/H23 linings are our leading option for a wide range of applications, delivering exceptional stopping power, safety, value—and RSD compliance. For those who prefer an OE-grade material, we also offer Abex 6326/6260, providing true factory-level performance and added peace of mind. New Regulations for Stopping Distance to Implement Began with 2012 Models New Vehicle Production Dates Number of Tractor Axles Tractor GVWR (lbs.) Loaded 60 MPH Stopping Distance (ft) Previous Current Aug 1, 2011 3 0 to 59,600 355 250 Aug 1, 2013 3 59,600 to 70,000 250 3 ≥ 70,000 310 2 All 250 2 0 to 85,000 250 ≥ 4 0 to 85,000 250 ≥ 4 >85,000 310
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