Home › CDL Practice Tests › General Knowledge Questions › Question 125
With the engine off, brakes released, and the system fully charged, you watch the gauges for one minute and pressure falls steadily. What have you found?
- A.An air leak somewhere in the system that must be located and repaired
- B.Normal behavior for every air system
- C.Proof that the governor is working
- D.A sign the tanks need more water
Correct answer
A. An air leak somewhere in the system that must be located and repaired
Why
A charged system should hold pressure with only a very small allowable loss over a minute. A steady fall means air is escaping through a line, valve, or chamber, and that loss will only get worse under working conditions.
Manual topic: Air Brakes - Air Leakage Check · From the General Knowledge practice bank (GK-125).