Home › CDL Practice Tests › Air Brakes Questions › Question 117
What device on many systems prevents compounding damage automatically?
- A.The air dryer purge valve
- B.The low-pressure buzzer
- C.An anti-compounding valve that prevents simultaneous full service and spring forces from stacking destructively
- D.The treadle valve boot
Correct answer
C. An anti-compounding valve that prevents simultaneous full service and spring forces from stacking destructively
Why
Anti-compounding plumbing routes air so that a service application backs off the spring side by an offsetting amount. It is a safeguard, not permission to deliberately stack both applications.
Manual topic: Air Brakes - Spring Brakes and Parking Brakes · From the Air Brakes practice bank (AB-117).