Practice question

For the Washington CDL Air Brakes knowledge test, 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

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