Practice question

On the Wisconsin CDL Air Brakes test, how do you test the parking brake in a pre-trip inspection (the tug test)?

Apply the parking brake, gently try to move the vehicle in low gear, and confirm the parking brake holds
Apply only the foot brake
Drain the supply tank and watch the gauge
Push the trailer air supply valve in

Answer: A — Apply the parking brake, gently try to move the vehicle in low gear, and confirm the parking brake holds

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