Practice question

Test the tractor protection valve by:

  1. Removing the air supply knob.
  2. Removing the parking brake control knob.
  3. Releasing air with the brake pedal.
  4. Releasing air with the gas pedal.

Answer: C — Releasing air with the brake pedal.

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

Practice more: New Jersey CDL Double Test 2 →