Question:
How do you check the low pressure warning signal?
A
Shut off the engine when the low pressure warning signal is not on. Turn the electrical power on and step on and off the brake pedal to reduce air tank pressure.
explanation
Shut the
engine off when you have enough air pressure so
that the low pressure warning signal is not on. Turn
the electrical power on and step on and off the brake
pedal to reduce air tank pressure. The low air
pressure warning signal must come on before the
pressure drops to less than 55 psi in the air tank (or
tank with the lowest air pressure, in dual air
systems).
(According to CDL Handbook)
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