K 3500 Truck 4WD V8-393 6.5L DSL Turbo (1993)
Brake Warning Indicator: Description and Operation
Battery voltage is supplied to the Brake Indicator when the Ignition Switch in in RUN or START. Two Switches are connected to the Brake Indicator.
When either one of these Switches closes, ground is provided and the Indicator Lights. The Brake Indicator is also connected to the Electronic Rear
Wheel Brake Control Module.
The Park Brake Warning Switch provides a ground when the Park Brake is applied. The Park Brake Warning Indicator lights to alert the driver.
The Brake Pressure Warning Switch closes to light the Brake Warning Indicator when there is low brake fluid pressure in one of the two hydraulic brake
systems. This could be caused by a leak in one of the brake lines.
The Electronic Rear Wheel Brake Control Module grounds the Brake Warning Indicator when the Module senses a fault in the Antilock Brake System.
The Electronic Four-Wheel Antilock Brake Control Module grounds the Brake Warning Indicator and the Antilock Brake Warning Indicator lamps
when the module senses a fault in the Antilock Brake System.
