Practice question

On which CMVs is ABS required by federal rule?

  1. All trucks built before 1990
  2. Truck tractors built on or after March 1, 1997, and air-braked trailers built on or after March 1, 1998
  3. Only passenger vehicles
  4. Only school buses

Answer: B — Truck tractors built on or after March 1, 1997, and air-braked trailers built on or after March 1, 1998

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Colorado CDL Air Brakes Practice Questions - Colorado CDL Air Brakes Knowledge Test Exam →