Practice question

Before a trip, you should test the tractor protection valve by:

  1. Removing the air supply knob.
  2. Removing the rear shut-off valve.
  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: West Virginia CDL Double Test 2 →