Practice question

In a newer vehicle, you apply the parking brake:

  1. By using a diamond-shaped yellow knob.
  2. By using a round red knob.
  3. By using a square green knob.
  4. By using a black round knob.

Answer: A — By using a diamond-shaped yellow knob.

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

Practice more: Massachusetts CDL Air Brakes Test 1 →