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What should happen to the low-pressure warning as air builds during a proper start-up?
- A.It should go out once pressure rises above roughly 60 psi and stay out in the normal operating range
- B.It should stay on until 150 psi is reached
- C.It should flash in time with the turn signals
- D.It should sound continuously above cut-in
Correct answer
A. It should go out once pressure rises above roughly 60 psi and stay out in the normal operating range
Why
The warning clearing as pressure climbs confirms both the build-up and the warning circuit in one observation. If it flickers at normal pressures, a leak or switch fault should be suspected.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-062).