Brake Fluid Level Sensor/Switch: Description and Operation

DESCRIPTION





The brake fluid level switch used on this vehicle's master cylinder is internal to the master cylinder fluid reservoir. The vehicle wiring harness has a connector which plugs directly into the brake fluid reservoir.
The brake fluid level switch in the brake fluid reservoir is not a repairable item. If the switch is found to be defective the entire brake fluid reservoir must be replaced.

OPERATION
The purpose of the brake fluid level switch is to provide the driver with early warning that brake fluid in the master cylinder is below a normal level.
As the fluid drops below the designed level, the switch closes completing the red BRAKE warning indicator lamp circuit. This will illuminate the red BRAKE warning indicator lamp located in the instrument cluster. At this time, the master cylinder fluid reservoir should be checked and filled to the full mark with DOT 3 brake fluid. If the brake fluid level has dropped in the brake fluid reservoir, the entire brake hydraulic system should be checked for evidence of a leak.