Home › CDL Practice Tests › Air Brakes Questions › Question 153
When checking air pressure build-up time, what problem is suggested if pressure rises very slowly from low pressure to the normal range?
- A.The compressor, governor, or system may have a fault, or there may be a significant leak
- B.Slow build-up is always caused by cold brake drums
- C.It means the tanks are larger than the vehicle needs
- D.It shows the slack adjusters are set correctly
Correct answer
A. The compressor, governor, or system may have a fault, or there may be a significant leak
Why
A healthy system builds pressure within the maker's expected time, and slow recovery means supply may not keep up with repeated brake use. Leaks and compressor faults must be ruled out before the vehicle is relied on.
Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-153).