Practice question

On the New Jersey CDL Air Brakes knowledge test, how should you park a CMV with air brakes?

  1. Use the foot brake
  2. Apply the parking brake (pull the yellow diamond knob out) once the vehicle has stopped, and chock the wheels if needed on a grade
  3. Leave the air running
  4. Use only the engine brake

Answer: B — Apply the parking brake (pull the yellow diamond knob out) once the vehicle has stopped, and chock the wheels if needed on a grade

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

Practice more: NJ CDL Air Brakes Test Practice Questions - New Jersey Commercial Driver License (CDL) Air Brakes Knowledge Test Exam →