Need to fix car so brake light will go off.

The brake light is on. What do I need to get fixed to make it to go off?
Experienced mechanics share their insights in answering this question :
On this particular vehicle only three things can trigger a brake light including the low brake fluid switch (LBFS), the pressure differential switch(PDS), and the parking brake switch (PBS). If the LBFS senses low brake fluid this will trigger a brake light and possibly indicate a leak of brake fluid. The PDS senses a difference in brake pressure between two pairs of wheels. If one pair of wheels has lower brake pressure the brake light will illuminate and this will indicate a leak as well. Finally, it is the job of the PBS to illuminate the brake light when the parking brake is in use however if the PBS is faulty it can sometimes keep the light on without the parking brake being applied. It is important that your brakes are in good working condition, you should get your brakes inspected by a certified mechanic.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common cause your brake lights stay on is because of a faulty brake light switch or sensor. It can also be caused by a faulty brake pedal or a malfunction in the electrical system. If you recently replaced the rear light bulbs when it occurred, you may have installed the wrong light bulbs.
Bad Switch: One common reason for the Parking Brake light to stay on is a failing or failed switch. This can be checked easily by jiggling the handle after it is down. If the light turns off (or turns off and then back on), the switch is the most likely culprit and will need to be replaced.
This can be caused by a dirty or broken wheel speed sensor or an electrical malfunction. Our technicians can properly determine the cause of the problem by running diagnostics.
Check Your Fuses

The first thing to check is whether or not the brake light fuse has blown. This fuse is usually located in the fuse box under the hood, and it`s relatively easy to check. Just remove the fuse and hold it up to a light – if the wire inside is broken, then you`ll need to replace the fuse.

Like all fuses, the brake light system fuse can be found in the power distribution center, which is under the dashboard or tucked away underneath the hood.
You can see your brake light switch by looking under the dash, near the top of the brake pedal. The brake light switch is usually attached to a small bracket that holds the switch, activated when the pedal is depressed, in position.
This is the most typical cause of your brake light becoming illuminated on your dashboard. The parking brake sensor will activate the brake warning light if the parking brake is still engaged. This occurs when the vehicle parking brake is not entirely disengaged, and the answer is to disengage it.
While seemingly harmless, driving with the parking brake on can actually cause a lot of damage to your brakes by compromising the brake fluid, overheating the brakes and wearing down the lining of the brake pads or shoes which will necessitate replacement.
Tip: When your brake lights stay on while your car is stopped, it can drain your battery. It`s important to resolve brake light issues right away so as to not drain your battery.
The most common brake light switch is the simple mechanical type mounted close to the brake pedal arm. When the pedal is depressed, the switch automatically closes to turn on the brake lights. The other type of switch works hydraulically and is operated by the pressure of fluid in the pipes when the brake is applied.
The stop lamp fuse is in the left kick panel inside the vehicle. It is a 15amp fuse that powers the stop light switch on the brake pedal.
Pull up on the brake pedal and if the lights go out, switch mis-alignment or pedal position error is the likely cause. The final possibility is a wire shorted to power. Unplug the brake-light switch and if the lights stay on, a short circuit is the case. Finding such a shorted-circuit, is best left to a professional.
A replacement brake light switch generally costs around $30 to $75, depending on the make and model of the vehicle. Getting a brake light switch fixed at a shop will add typically $80 to the repair. Yes, you can change your own brake fluid.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

Brake lights are not working. replaced brake light swtch still no brake lights. the third brake light the connection was melted at
ANSWER : The first thing to do is to repair third brake light and replace the brake light fuse and then see if the third brake lights work and the lower lights start working? If only the 3rd brake light starts working then you may need a further checks on the turn signal flasher or switch could be bad.

Do I really need 4 new brake lines if no brake light is on and no visible brake problems while driving?
ANSWER : Hello. Depending on the area you live in, it is common for brake lines to corrode over time and need replacement. It is not too common, but in areas that have a lot of road salt this will occur. If it is the rubber lines then they just need to be replaced. If you want to have repaired, consider YourMechanic, as a certified mechanic can come to your home or office to replace the brake lines for you.

Battery and oil light come on when trying to start car, take keys out try again car starts no problem and lights go away
ANSWER : Of course, don’t switch gears without being fully stopped, unless your Owner’s Manual or the manufacturer has alternative advice. However, the gear shift issue has no relation to the no-start problem you are describing. Inasmuch as you only have 6,000 miles on the car, the "constant on and off" that you believe has occurred is meaningless in comparison to the expected total vehicle service life. That is, assume what you perceive as "constant on and off", during merely 6,000 miles, might be equivalent to using the car "normally" for three years. A new car should be trouble free for at least 5 years, unless there is a defect, so your "constant on and off" is not a causal factor for any fault on the vehicle. What you might have is a defect in the ignition switch, or perhaps the immobilizer system, but if the problem is not in the switch itself, clearly there is an electrical problem.

If your vehicle is under warranty, by law the dealer MUST repair the issue you are describing within a prescribed time frame and number of "attempts", otherwise the dealer will run afoul of Federal and state Lemon Laws that give you very specific rights, and recourse (contact an Attorney; we are Mechanics, NOT attorneys). Consequently, if the vehicle is still under warranty, to save yourself money do be sure to seek a resolution from the dealer. If the vehicle is not under warranty, obviously a certified Mechanic from YourMechanic could identify the electrical fault and resolve this for you. If you want to go that route, please simply request a no start diagnostic -electrical system and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

I replaced the brake light switch. Gear lever unlocked because it had locked. Now the brakes feel hard.
ANSWER : Hi, thanks for writing in. You need to check the brake switch install adjustment. You may have the switch adjusted too tight and it is holding the the brake pedal partly down. This will cause the brake master cylinder to not release the brakes when you let off the pedal. Readjust the switch away from the pedal until you feel some free play again in the pedal. This should fix the problem. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Abs light, emergency brake light, steering wheel assist light, engine light, EPC light, traction control light
ANSWER : Hello, thank you for writing in. The vehicle does utilize a lot of the same sensors for these systems. Are there any other codes that are coming up when this code appears? If so you will want to take these into consideration when processing the repair and making a diagnosis. The module may be bad, and replacing it should fix the problem. The lights should turn off once the main computer recognizes the new module and the sensors sync up. If you believe the sensors need to be cleaned you may do so. Do as minimal as possible to make sure you are not damaging the sensor or disrupting the wiring inside. A bad connection would make the lights stay on. With so many lights that are effected by the module being illuminated, the module is likely bad or does not have a connection. Check the connection first and then resort to replacing the unit. For more help with these electrical tests, contact our service department.

abs light on brake line broke have been replace I bleed brake line but brake pad still go to the floor now wheels lock up
ANSWER : Hello. If the brake pedal is going to the floor then that means that it is not building pressure. If the brake system has been fully bled and there is no air in it then most of the time it is a bad master cylinder or it can be caused by a bad ABS module. If the brake fluid was low and if air got into the system then the only way to properly bleed it is with a scan tool that would allow you to open and close the valves in the ABS unit. Air gets trapped in these easily if the brake fluid gets low. This can also explain why the brakes are locking up. I would usually use my scan tool to bleed the system out first before going any further. I would also scan the brake control module to see what it is reading as a fault. If there is no air in the system and if there is no prominent code then I would replace the master cylinder first. If you want to check out why your brakes are locking up, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.