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Question:

Before pressure in the service air tanks fall below ____ psi, the driver must be able to see a low air pressure warning which comes on.

A 60
explanation

A low air pressure warning signal is required on vehicles with air brakes. A warning signal you can see must come on before the air pressure in the tanks falls between 55 and 75 psi (or 1/2 the compressor governor cutout pressure on older vehicles). [California Commercial Driver Handbook]

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