Brake Fluid Level Sensor/Switch: Description and Operation

DESCRIPTION






The brake fluid level switch is located in the brake fluid reservoir of the master cylinder assembly. The purpose of the sensor is to provide the driver with an early warning that brake fluid level in master cylinder reservoir has dropped to below normal. This may indicate an abnormal loss of brake fluid in the master cylinder fluid reservoir resulting from a leak in the hydraulic system.

OPERATION
As the fluid drops below the minimum level, the fluid level switch closes the brake warning lamp circuit. This will turn on the red brake warning lamp. At this time, master cylinder fluid reservoir should be checked and filled to the full mark with DOT 3 brake fluid. If brake fluid level has dropped in master cylinder fluid reservoir, the entire brake hydraulic system should be checked for evidence of a leak.