The DOT is responsible for enforcing minimum standards for commercial motor vehicles, which are defined by law as vehicles used in interstate commerce to transport passengers or property that either have a gross vehicle weight rating (GVWR) of at least 10,001 lbs; are designed to transport at least seven passengers; or are used to transport hazardous materials.
Steering Axle Brakes
49 CFR 393.47(d)(1) states that the thickness of the brake lining and pads of steering axle brakes on a truck, truck-tractor or bus “shall not be less than 4.8 mm (3/16 inch) at the shoe center for a shoe with a continuous strip of lining.” The thickness requirements are at least 6.4 mm (1/4 inch) for two pads. If air brakes are used, the minimum thickness is 3.2 mm (1/8 inch). If hydraulic disc, drum or electric brakes are used, the minimum thickness is 1.6 mm (1/16 inch).
Non-Steering Axle Brakes
49 CFR 393.47(d)(2) states that the thickness of the brake lining and pads of non-steering axle brakes on an air braked commercial motor vehicle shall not be less than 6.4 mm (1/4 inch)
If disc brakes are used, the minimum thickness is 3.2 mm (1/8 inch). If hydraulic or electric brakes are used, the minimum thickness is 1.6 mm (1/16 inch).
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