The brake lights stayed on after the master cylinder was replaced. the mechanic then disconnected the brake switch and the lights stayed on.
If the brake lights stay on when the brake switch wiring connector is disconnected , you have a short somewhere ! Because if disconnected electrical the adjustment on the brake light switch means nothing ! IT'S DISCONNECTED, HELLO !!!!!!!!
The brake switch is a "normally closed" switch, so, disconnected it will be on.
Brake light is controlled by a switch on the brake pedal arm. The switch may need adjustment or be replaced.
Hope this helps.
Be sure that brake pedal is all the way up even if you have to pull it up or thers a wire shorted
SOURCE: brake lights still on..05 volvo xc90
If the switch itself is not faulty you probably have a short somewhere in the wiring harness.That could be hundres of places so I am not sure after that... Sorry
SOURCE: Brake Lights Stay on 91 Chevy Silverado
there is a short in the wire underneath by the brake pedal keeping it on
SOURCE: 2002 suzuki grand vitara brake warning goes on and off
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.
SOURCE: 91 honda accord brake lights stay on replaced
are you sure you the adjustment to it is correct the button in the end of the switch has to be fully depressed to deactivate the circuit
SOURCE: the ABS light stays lit on my 2000 Subaru
ABS is anti lock braking system,which helps to stop car in various conditions.Wet/slippery etc
Sensors are located on all brakes
You need to go to your local auto electrician who will plug in scanner to locate fault
If you look underneath your bug on the driver's side where the master cylinder is you will see 2 electrical plugs plugged into the master cylinder. Each plug has 3 wires. Disconnect both from the master cylinder and see if the brake lights go out. If so, then replace both brake light switches on the master cylinder. You can disconnect one at a time and see if the lights go out that way. Which ever one that causes the lights to go out when disconnected is the bad switch. The light circuit will work with only one switch connected, so if neccessary you can get by on one switch.
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