Home › CDL Practice Tests › Air Brakes Questions › Question 131
After building air pressure to governor cut-out, turning the engine off, and making a full brake application, what does a continuing drop on the air gauge after the initial drop tell you?
- A.The compressor governor is set correctly
- B.There is an air leak in the system that must be found and repaired
- C.The brake chambers are larger than normal
- D.The parking brakes are releasing as designed
Correct answer
B. There is an air leak in the system that must be found and repaired
Why
Once the initial application drop settles, pressure should hold fairly steady except for a small allowable loss. A steady continued fall means air is escaping somewhere, and that leak can outrun the compressor on the road.
Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-131).