Wig wag (truck braking systems)
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This article is about the truck brake system warning signal. For other uses, see Wigwag (disambiguation).
In truck braking systems, one type of warning for low air pressure in an air brake system of commercial trucks is called the wig wag. This device drops a mechanical arm into view when the pressure in the system drops below 60 p.s.i. An automatic wig wag will rise out of view when the pressure in the system goes above 60 p.s.i. The manual reset type must be placed in the "out of view" position manually. It will not stay in place until the pressure in the system is above 60 p.s.i.
Most state CDL (commercial drivers license) manuals describe this term.
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