CDL Test - Reduce air pressure below 60 psi by pumping the brakes

How can you make sure the low air pressure warning light in your vehicle is working properly?

Reduce air pressure below 60 psi by pumping the brakes with the engine off.

Pump the brakes while the engine is turned on.

Fill the tires with water to check pressure stability.

Completely remove the air compressor to check.

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