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A wig wag is:
A.  A low pressure warning device.
B.  A tube that carries air to the brakes.
C.  A type of air brake system.
Vehicles with air brakes are required to be equipped with a low pressure warning device. A wig wag is a type of low air pressure warning device. This device drops a mechanical arm into the driver's view if the pressure in the tanks drops to a level between 55 and 75 psi.
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