Brake Lights do not go out

USUALLY at the 'hidden' end of your BRAKE PEDAL a BRAKE SWITCH resides... much like a doorbell button.

As the pedal is pressed, the BUTTON (within the Switch itself)... 'pops out' and the Switch turns on = your brake lights turn ON. Note the two "adjustment nuts" in Photo 1.

IF the SWITCH is not positioned/adjusted correctly ~ the brake lights STAY ON. Many are designed to STAY ON if the switch itself fails... The hope is "constant-on" condition will alert the owner/driver of a brake system problem!

Please know many brake light switches may be installed at the master brake cylinder (Photo 2). Note: No adjustment nuts.

Mcmom, Either your brake pedal is not coming up far enough to the brake switch, or the brake switch is faulty. You may still have air in brake system not allowing pedal to come up high enough to contact switch, pull brake pedal all the way up and have a second person see if brake lights go off.
Links below to show brake switch location and show how brake pedal arm should come all the way up to turn off brake lights.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."


How To install Replace Brake Light Switch 2004 08 Ford F150 and more...

Brake lights stay on

brake lights stay on Ford F150 Forum

If brake lights are staying on constantly, suspect defective/sticky brake light switch located just above brake pedal under dash.

Most likely problem is the brake light switch is broken or out of adjustment. The switch is located under the dash on the arm lever of the brake pedal. When the pedal is at rest, the arm presses the switch in and turns off the lights. If the switch gets loose, broken, or out of adjustment, it may not close and allow the lights to stay on constantly.

probably switch at the brake pedal, have somebody stand behind and lift the pedal and see if it goes out, check the switch it may be out of line with the pedal. most likely it works by a button that is pushed when you push the pedal. if it is not this switch then you may have a short somewhere across the brake wire

CHECK BRAKE LIGHT SWITCH TO SEE IF ITS TOUCHING THE BRAKE PEDAL.IF BRAKE LIGHT SWITCH OR BRACKET LOOSE AND AWAY FROM BRAKE PEDAL BRAKE LIGHT WILL STAY ON.IF BRAKE LIGHT SWITCH INTACT BRAKE LIGHT SWITCH NEED REPLACING.WHEN REPLACING BRAKE LIGHT SWITCH OR IT NEEDS ADJUSTING MAKE SURE BRAKE LIGHT SWITCH PLUNGER TOUCHES BRAKE PEDAL ARM WHEN YOU RELEASE BRAKE PEDAL BRAKE LIGHTS SHOULD TURN OFF.

The brake light switch is located is located under the
dash, at top of the brake peddle.
To test the sw, use a 12v test light check for constant power out of the switch, with nothing else on. If there's pwr. out replace the switch.
Hope this helps. Good luck

Is it just the Rear Window Light that stays on, or is the Rear Window Light and the brake lights located at the back/bumper of the car? If it is BOTH the Rear Window Light AND the brake lights at the rear of the car, then you likely have a faulty brake switch located at the brake pedal inside the car cabin. When the brake pedal is in the normal position, ie - you are not depressing the brake pedal, the arm of the brake pedal leading to the pedal with your foot pushes upon... this arm is applying constant pressure to the switch - with keeps your brake lights OFF. When you apply pressure to the brake pedal, it moves the brake arm away from the switch, which activates the circuit, and your brake lights turn on. If this switch is broken, your brake circuit thinks the brake pedal and arm are being pushed away from the switch, and your brake lights turn on. As you are aware, having the light on constantly can wear down your battery AND the heat from this constant light bulb of the brake light in the rear window can deform the shape of the red reflector in this rear window light housing. If, however, it is only the rear window light that stays on - then it is probably a loose or bad connection where this light plugs into the rest of the circuit in the trunk near the back seat. If this is the case, follow the wires from the rear window light assembly to the point where they plug into the rest of the circuit (inside the trunk) and unplug this wire set, clean the terminal ends, and plug them back together. ***WAIT, WAIT!!*** because you of the risk of touching the terminal ends together and blowing the circuit, if you also plan to clean the hot side, please remove the NEGATIVE battery terminal while cleaning (DO NOT USE WATER, just a wire brush or steel wool). After you are done cleaning and have the terminals reconnected, reconnect the negative battery terminal (you will also have to reset your radio stations and radio clock).

your brake light is always on because the stopper at the brake switch is destroyed that's why it doesn't turn off. just put something hard to fill the hole at the brake pedal.

check common rail. maybe the problem concerns with a lack of ground (car chassis), and the return path is made through the other bulbs.
Use a 400-grade sand paper to clean the contacts and the metal part of the bulbs.