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What forms can the low air pressure warning take?
- A.A change in radio volume
- B.A vibration in the steering wheel only
- C.A message that appears only after the trip
- D.A red warning light and buzzer, or a mechanical wig wag that drops into the driver's view on older vehicles
Correct answer
D. A red warning light and buzzer, or a mechanical wig wag that drops into the driver's view on older vehicles
Why
The warning must be impossible to miss, so it combines visual and audible signals in most cabs. Whatever the form, seeing or hearing it at low pressure means stop as soon as it is safe.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-055).