There are two common types of ‘wig-wag’ low pressure warning devices that may be used. Both types will drop into the driver’s view when the pressure in the system drops below approximately 60 P.S.I. The automatic warning device will rise out of the driver’s view when the pressure in the system rises above 60 P.S.I. The manual reset type must be placed in the ‘out of view’ position manually and will not stay in place until the pressure in the system goes above 60 P.S.I.

Whichever warning system is used (buzzer, lights or wigwag) the driver MUST STOP their vehicle and find the cause of the air loss. The air pressure remaining in the system (approximately 60 P.S.I.) is enough for brake application if the driver acts promptly.