Brake Warning Indicator: Description and Operation

Brake circuit warning light




The warning light is located on the instrument panel (dashboard) and comes on if the brake fluid in the brake fluid level reservoir is too low. The brake fluid level sensor is located in the brake fluid reservoir, and consists of a magnetic floater which makes a contact if the brake fluid falls below the MIN level. When the contact closes, it grounds an output on the instrument panel (dashboard) and the warning light comes on.
When the ignition is switched on, the warning light comes on whatever the position of the brake fluid level sensor. Once the engine is running (alternator charging), the warning light only comes on if the brake fluid level is too low. If the light comes on while driving or when braking, the brake fluid level is too low and the car should not be driven any further until the fault has been corrected.