Home › CDL Practice Tests › Air Brakes Questions › Question 58
During the low-pressure warning test, the gauge falls to 50 psi with no light or buzzer. What does this mean?
- A.The test passed because the brakes still work
- B.Warnings are optional below 60 psi
- C.The warning device has failed its test and the vehicle should not be driven until it is repaired
- D.The gauge must be wrong in every case
Correct answer
C. The warning device has failed its test and the vehicle should not be driven until it is repaired
Why
A silent warning removes the driver's only advance notice of air loss, which is exactly when crashes happen. The defect is a failed inspection item, not a minor inconvenience.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-058).