How to Fix Brake Lights That Won’t Turn Off
1) Replace the Brake Light Switch
The most common reason for brake lights not turning off is a faulty brake light switch. To fix this issue, you’ll need to replace the switch.
First, locate the switch near the brake pedal. Disconnect the wiring connector and remove the old switch. Fit the new switch, reconnect the wiring connector, and test your brake lights to ensure they turn off when the pedal isn’t pressed.
2) Fix the Wiring
Sometimes, the problem lies in the wiring that connects the brake light switch to the brake lights. Carefully inspect the wiring for any signs of damage, such as frayed wires or corroded connections.
If you find any issues, you may need to repair or replace the damaged wiring. Make sure that all connections are secure and test your brake lights to see if they now turn off correctly.
3) Unstick the Brake Pedal
Occasionally, the brake pedal may become stuck in a slightly depressed position, causing the brake lights to stay on. Check that nothing is obstructing the pedal’s motion and ensure it moves freely. If the pedal, itself, is not the issue, inspect the switch and its connections for proper functioning.
4) Adjust the Sensor
Some vehicles use sensors to detect when the brake pedal is engaged. If the sensor is misaligned or malfunctioning, it may cause the brake lights to stay on. To fix this, locate the sensor and adjust its position so that it correctly detects when the pedal is pressed and released. After adjusting the sensor, test your brake lights to make sure they turn off as expected.
5) Address CAN Bus System Issues
Modern vehicles often use a CAN Bus system to control the vehicle’s lighting. If the CAN Bus system has an issue, it could cause the brake lights to stay on even when the pedal is not engaged.
Unless you have the correct mechanical experience and access to a proper service manual that covers CAN Bus system issues, it’s best to leave this repair to the experts.
What To Do If a Brake Light is Out
If you have one brake light that is not operating, the most logical failure mode is a burned out bulb. The bulb may be a conventional design with a filament or may be an LED (Light Emitting Diode) specially designed for the CAN Bus system if your car is so equipped.
Replacement by a qualified mechanic is recommended but a good service manual will have instructions on replacing the bulb yourself.
A less likely failure could be a blown fuse. Check the fuse box either under the hood or beneath the dash, generally on the passenger’s side. Your owner’s manual will show the location of the fuse panel and should identify which fuse powers the brake lights.
If the new fuse blows the first time you apply the brakes, the fault is somewhere in the wiring. Do not repeat this exercise as an uncorrected short circuit can cause other electrical system damage.
If more than one brake light bulb is not operating, the more likely failure will be in the electrical and/or the CAN Bus system. See a qualified mechanic for corrective action.
If You MUST Drive
Ideally, you’ll stay off the road if your brake lights won’t turn off (or won’t turn on). But for those instances where you absolutely have to get back home or to a repair shop, you’ll want to take the correct safety measures.
Hand Signals
Using hand signals are the old-school way of communicating your intentions to other drivers. When turning or stopping, extend your arm out of the window to signal a left turn, a right turn, or a stop.
Slowing Down
When your brake lights won’t turn off, it’s important to adopt a more cautious driving style. Slow down, especially when approaching intersections, traffic lights, or tight corners. This way, you can minimize the risk of accidents and give other drivers enough time to react to your vehicle.
Preventing Accidents
To keep yourself and others safe when your brake lights are stuck on, consider the following tips:
1. Maintain a greater distance than usual between your vehicle and the one in front of you. This gives you more time to react in case of sudden stops or changes in traffic flow.
2. When driving at night and you realize your tail lights are malfunctioning, the best thing to do is pull over to a safe area and get your vehicle towed to a repair shop. Driving in the dark with faulty tail lights is a recipe for disaster.
3. Get your brake lights fixed ASAP. Don’t procrastinate on addressing the issue. Take your vehicle to a professional mechanic and fix the problem as soon as possible.
