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Question:

What is the best way to test your vehicle's low air pressure warning signal?

A With the engine off, step on and off the brake pedal to lower the air pressure below 60 psi.
Explaination

Turning off your vehicle's engine while leaving the electrical power on is the easiest approach to test the low air pressure warning indicator. Then press and release the brake pedal. When the pressure drops below 60 psi, the low air pressure warning light should illuminate. It should never be necessary to go below 30 psi.