Home › CDL Practice Tests › Air Brakes Questions › Question 61
After start-up, the low-pressure warning stays on even though the gauge shows 125 psi. What is the best interpretation?
- A.The tanks must actually be empty
- B.The driver should fan the brakes until it clears
- C.The warning switch or circuit may be faulty, and it should be checked rather than ignored
- D.High pressure always keeps the warning on
Correct answer
C. The warning switch or circuit may be faulty, and it should be checked rather than ignored
Why
A warning that lies in either direction destroys trust in the device the driver depends on. Discrepancies between gauge and warning need diagnosis before the vehicle is put to work.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-061).