Home › CDL Practice Tests › Air Brakes Questions › Question 34
At about what pressure does the governor cut in and restart the compressor pumping?
- A.About 45 psi
- B.About 135 psi
- C.About 100 psi
- D.About 150 psi
Correct answer
C. About 100 psi
Why
Cut-in is roughly 100 psi, well below cut-out, so the compressor does not cycle on and off with every small pressure change. That gap also guarantees a useful reserve stays in the tanks between cycles.
Manual topic: Air Brakes - Air Compressor and Governor · From the Air Brakes practice bank (AB-034).