Home › CDL Practice Tests › Air Brakes Questions › Question 67
What does a safety valve that is stuck closed create a risk of?
- A.Brakes that apply too gently
- B.Dangerous over-pressurization of tanks and lines if the governor also fails
- C.A low-pressure warning that comes too early
- D.Extra water collecting in the tanks
Correct answer
B. Dangerous over-pressurization of tanks and lines if the governor also fails
Why
The safety valve only matters on the worst day, when pressure control is already lost. If it cannot open at about 150 psi, that failure has no backup left.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-067).