Brakes

DOT regulations require each commercial motor vehicle to have brakes acting on all wheels. Brakes must be capable of operating at all times, and must be adequate to stop and hold the vehicle or combination of motor vehicles. Each commercial motor vehicle must also meet applicable service, parking, and emergency brake system requirements below.

Service Brakes

Motor vehicles equipped with hydraulic brake systems and manufactured on or after September 2, 1983 must, at a minimum, have a service brake system that meets the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 105 in effect on the date of manufacture.

Buses, trucks and truck-tractors equipped with air brake systems and manufactured on or after March 1, 1975, and trailers manufactured on or after January 1, 1975, must, at a minimum, have a service brake system that meets the requirements of FMVSS No. 121 in effect on the date of manufacture.

Parking Brakes

Each commercial motor vehicle must be equipped with a parking brake system. Parking brake systems generally must meet the following requirements:
  • Hydraulic-braked vehicles (trucks and buses other than school buses) manufactured on or after September 2, 1983, must be equipped with a parking brake system as required by FMVSS No. 571.105 (S5.2) in effect at the time of manufacture.
  • Air-braked buses, trucks, and tractor trailers manufactured on or after March 1, 1975, must be equipped with a parking brake system as required by FMVSS No. 121 (S5.6) in effect at the time of manufacture.

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