Home › CDL Practice Tests › Air Brakes Questions › Question 134
What is the correct way to test the service brakes after starting a trip or inspection?
- A.Drive at highway speed and make one maximum stop in traffic
- B.Apply only the trailer hand valve while turning a corner
- C.Coast in neutral and judge stopping by sound alone
- D.Drive at about 5 mph, apply the brakes firmly, and check that the vehicle stops smoothly without pulling to one side or unusual pedal feel
Correct answer
D. Drive at about 5 mph, apply the brakes firmly, and check that the vehicle stops smoothly without pulling to one side or unusual pedal feel
Why
A slow-speed service brake test confirms the brakes actually stop the vehicle and that braking is balanced before you need them at speed. Pulling, delay, or a strange pedal feel at this stage is a warning to stop and have the system checked.
Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-134).