Practice question

For an Wisconsin CDL air-brake vehicle, 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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