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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

The best way to test the low air pressure warning signal is to turn off the engine of your vehicle while leaving the electric power on. Then step on and off the brake pedal. The low pressure warning signal should come on when the pressure falls below 60 psi. You should never need to get down to 30 psi.