Home › CDL Practice Tests › Air Brakes Questions › Question 95
If the gauges disagree sharply with each other during a dual-system leakage test, what should the driver suspect?
- A.Both gauges can be ignored if the brakes feel fine
- B.Disagreement is normal and required
- C.The higher gauge is always the correct one
- D.A fault isolated to one circuit, or a faulty gauge, either of which must be resolved before trusting the test
Correct answer
D. A fault isolated to one circuit, or a faulty gauge, either of which must be resolved before trusting the test
Why
Dual gauges are a diagnostic gift: they localize a leak to one side of the system. Driving with an unexplained disagreement throws that information, and the safety margin, away.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-095).