Brake warning light stays on sometimes and then goes off.......master cylinder is full
Do you have a brake fluid accumulator(ABS)? If yes, the pistons/pulsing assembly are worn, and may need to be replaced.
If not, you may have a vacuum leak in the power booster (located on the firewall). Check all hose and clamps for a tight fit/cracks,etc. Vacuum leaks cause intermittent brake failure lights.
You may want to park the vehicle on a clean surface, pump the brakes a few times, and check for brake fluid leaks. If there is a leaking wheel cylinder (back brakes) , caliper (front brakes), or brake line, you will be able to see it.
Leaks cause pressure loss, and, thus, the brake warning light will illuminate.
Check behind your brakes where the electrical connector is and see if it is loose or damaged.
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