Practice question

When the spring brakes are activated in a vehicle with air brakes, you should never:

  1. Turn on the lights.
  2. Turn the vehicle off.
  3. Push the brake pedal down.
  4. Open the trailer doors.

Answer: C — Push the brake pedal down.

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

Practice more: District Of Columbia CDL Air Brakes Test 1 →