Home › CDL Practice Tests › Air Brakes Questions › Question 132
What are you checking when you test the air compressor governor cut-out pressure?
- A.That the compressor stops pumping at the specified maximum system pressure, around 120 to 125 psi on many systems
- B.That the compressor starts the engine automatically
- C.That the low air warning buzzer stops sounding
- D.That the spring brakes apply at highway speed
Correct answer
A. That the compressor stops pumping at the specified maximum system pressure, around 120 to 125 psi on many systems
Why
The governor tells the compressor when to stop and resume pumping so tanks stay in the normal operating range. Cut-out that is far too high can over-pressure the system, while pressure that never builds points to a compressor or governor fault.
Manual topic: Air Brakes - Brake Inspection · From the Air Brakes practice bank (AB-132).