Home › CDL Practice Tests › Air Brakes Questions › Question 110
A driver parks and pulls both knobs out, but the vehicle slowly rolls. What is a possible cause to report?
- A.Spring brakes not holding, due to worn or out-of-adjustment brakes, weak springs, or brakes set while very hot or wet and then drying or cooling
- B.The radio was left on
- C.The fuel tank is too full
- D.The mirrors are folded in
Correct answer
A. Spring brakes not holding, due to worn or out-of-adjustment brakes, weak springs, or brakes set while very hot or wet and then drying or cooling
Why
A parking brake that cannot hold on a grade has failed its one essential job. The vehicle must be secured with chocks and the brake defect repaired before it is trusted again.
Manual topic: Air Brakes - Spring Brakes and Parking Brakes · From the Air Brakes practice bank (AB-110).