Practice Quiz

Commercial Driver's License

Category - Emergencies

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Which of the following vehicles are required to have anti-lock braking systems (ABS)?
  1. Truck tractors that use air brakes and were built after March 1, 1997
  2. Buses and trailers with air brakes built after March 1, 1998
  3. Hydraulic brake buses and trucks with GVWR over 10,000 that were built after March 1, 1999
  4. All of the above
Explanation
Answer: D - Some commercial vehicles are required by law to have anti-lock braking systems. These include truck tractors with air brakes built on or after March 1, 1997. The law also includes all other air brake vehicles such as buses and trailers that were built on or after March 1, 1998. In addition, hydraulically braked trucks and buses that have a gross vehicle weight rating (GVWR) of 10,000 lbs. or more, that were built on or after March 1, 1999, must also have ABS installed.
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