What to do when your brake lights won’t turn off
1) Replace the brake light switch
The most common cause of brake lights not turning off is a faulty brake light switch. To fix this problem, you’ll need to replace the switch.
First, locate the switch near your brake pedal. Disconnect the cable connector and remove the old switch. Install the new switch, reconnect the cable connector, and test the brake lights to make sure they turn off when the pedal is not pressed.
2) Repair the wiring
In some cases, the problem may lie in the wiring that connects the brake light switch to the brake lights. Carefully inspect the wiring for signs of damage, such as frayed wires or corroded connections.
If you notice any issues, you may need to repair or replace the damaged wiring. Make sure all connections are secure and test that the brake lights turn off properly.
3) Release the brake pedal
In some cases, the brake pedal may get stuck in a slightly depressed position, causing the brake lights to stay on. Make sure the pedal is free to move and that it moves smoothly.
If the pedal itself is fine, check the switch and its connections to make sure they are working properly.
4) Adjust the Sensor
Some vehicles use a sensor to detect when the brake pedal is pressed. If the sensor is misaligned or faulty, it could cause the brake lights to stay on.
After adjusting the sensor, test your brake lights to make sure they turn off as expected.
5) Troubleshooting CAN Bus System Issues
Modern vehicles often use a CAN bus system to control the vehicle’s lighting. If there is a problem with the CAN bus system, the brake lights may stay on even when the pedal is not pressed.
What to do if your brake lights fail?
If your brake lights are not working, the most logical cause of the problem is a burned out bulb. The bulbs can be traditional filament types or LEDs (light-emitting diodes) designed specifically for CAN bus systems if your car is equipped with one.
We recommend that you have it replaced by a qualified mechanic, but a good service manual will tell you how to replace a bulb yourself.
It’s possible, although unlikely, that you have a blown fuse. Check the fuse box under the hood or under the dashboard (usually on the passenger side). Your owner’s manual should tell you where the fuse box is located and tell you which fuse powers the brake lights.
If the new fuse blows the first time you apply the brakes, there is a fault somewhere in the wiring. Do not repeat this exercise, as the short circuit may cause additional damage to the electrical system if left uncorrected.
If multiple brake bulbs do not work, there is likely a fault in the electrical system and/or CAN bus system. Have repairs made by a qualified mechanic.
When you must drive
Ideally, if your brake lights go out or stay on, stay off the road. However, if you absolutely must return to your home or work site, you should take appropriate safety precautions.
Hand signals
Hand signals are an old-fashioned way of communicating your intentions to other drivers. When turning or stopping, extend your arm out the window to indicate a left turn, right turn, or stop. You should practice these hand signals in case your brake lights fail.
Slow down
If your brake lights won’t go out, it’s important to adopt a more cautious driving style. Slow down especially when approaching intersections, traffic lights, or sharp curves. This will help minimize the risk of an accident and give other drivers enough time to react to your vehicle.
Avoid Accidents
Consider these tips to protect yourself and others when your brake lights stop working:
1. Leave a larger than normal distance between you and the vehicle in front of you. This gives you more time to react to a sudden stop or change in traffic flow.
2. If you’re driving at night and notice that your tail lights aren’t working, it’s best to drive to a safe place and have your vehicle towed to a repair shop. Driving in the dark with a broken tail light is a recipe for disaster.
3. Repair your brake lights as soon as possible. Don’t hesitate to fix the problem. Take your car to a professional mechanic and have the problem fixed as soon as possible.