Parking Brake System: Description and Operation

The brake warning light goes on to alert the driver that the parking brake is applied or that the brake fluid level is low. It also lights as a bulb test when the engine is cranked

With the ignition switch in ON or START, battery voltage is applied from fuse 10 to the brake warning light. When the provides brake is applied, the switch closes and provides a ground for the light. The brake warning light goes on to remind the driver that the parking brake is applied.