A new technical report is now available from the National Highway Traffic Safety Administration (NHTSA) assessing antilock braking performance on heavy-duty trucks and trailers. The report provides a performance review of the systems required under NHTSA’s current Safety Standard 121, Air Brake Systems. The report's title is: The Effectiveness of ABS [Antilock Braking Systems] in Heavy Truck Tractors and Trailers.
FMVSS 121 (49 CFR 571.121) mandated antilock braking systems (ABS) on all new air-braked vehicles with a GVWR of 10,000 pounds or greater. ABS is required on tractors manufactured on or after March 1, 1997, and air-braked semi-trailers and single-unit trucks manufactured on or after March 1, 1998.