Home › CDL Practice Tests › Air Brakes Questions › Question 5
If one circuit of a dual air brake system fails completely, what should the driver expect?
- A.Braking will be completely normal with no change
- B.The vehicle will stop instantly on its own in all cases
- C.Some braking will remain, but stopping distance will be longer and the vehicle should be stopped safely as soon as possible
- D.Only the parking brake will be affected
Correct answer
C. Some braking will remain, but stopping distance will be longer and the vehicle should be stopped safely as soon as possible
Why
The surviving circuit was designed to bring the vehicle to a stop, not to continue the trip. Because only part of the foundation brakes are working, distances grow and the defect must be repaired before driving further.
Manual topic: Air Brakes - Dual Air Brake Systems · From the Air Brakes practice bank (AB-005).