Where is the brake light button?
In most passenger cars, there isn't a dedicated brake light button to press. Instead, the rear brake lamps are activated by a switch that sits near the brake pedal and is pushed as you depress the pedal. This article explains what the brake light switch is, where you typically find it, and what to do if your brake lights aren’t illuminating.
What the brake light switch does
The brake light switch, sometimes called the stop light switch, is a small sensor or mechanical switch that completes the circuit to the rear brake lights whenever you press the brake pedal. When the pedal is released, the switch opens the circuit and the lights switch off. In some modern cars, the switch is electronic or integrated into the pedal assembly, and a body control module monitors pedal position to illuminate the lights reliably.
Where it's typically located
Look near the base of the brake pedal, where the pedal arm connects to its mounting bracket. Depending on the vehicle design, the switch may be:
Mechanical vs. electronic switch designs
In many older designs, the switch is a mechanical plunger that the pedal directly depresses. In newer vehicles, the function may be performed by an electronic sensor within the pedal assembly or a nearby bracket, with signals read by the vehicle’s body control module.
- Mounted to the brake pedal assembly itself, with a small plunger that the pedal depresses.
- Behind the dash near the pedal pivot, sometimes just above the footwell area.
- On the firewall or a bracket that supports the pedal assembly, particularly in older designs.
- Integrated into the steering-column area in vehicles with electronic brake systems.
Regardless of the exact spot, the switch is in the path of the pedal movement and is wired to the brake lights and, in some cars, to the cruise control or stability systems.
What to do if brake lights don’t work
When brake lights fail, safety and legality are at stake. Use this quick checklist to diagnose common causes before calling a technician:
- Check the brake lights themselves: replace burned-out bulbs and inspect the tail light assemblies for damage.
- Inspect fuses and wiring related to the brake light circuit.
- Test the brake light switch by pressing the pedal and looking for a change in switch position or light activation. Some switches have a visible plunger; others require a multimeter to test continuity.
- Inspect connectors for corrosion or loose wiring at the switch and near the tail lights.
- If equipped, scan for error codes with a code reader; a faulty switch can trigger a diagnostic trouble code in the body control module.
If you cannot confidently diagnose or repair the issue, have a qualified mechanic inspect the brake light switch to ensure the vehicle remains roadworthy and compliant with local regulations.
Summary
Most cars do not have a user-pressable “brake light button.” The brake lights are controlled by a brake light switch located near the brake pedal, either as part of the pedal assembly or just behind the dash. Knowing where to look, and what to check, can help you diagnose a common safety issue quickly. Regular maintenance and timely bulb or fuse checks keep your brake lights functioning, protecting you and others on the road.
Where is the brake light switch located?
The brake light switch is located underneath the dashboard on the driver's side, attached to or near the top of the brake pedal. To find it, look up from the floor where the brake pedal is, and you will see a switch connected to the pedal arm or a bracket next to it.
You can watch this video to see where the brake light switch is located and how to remove it: 1mCarsNToysYouTube · Sep 14, 2018
- Location: The switch is positioned high up where the brake pedal arm goes through the firewall.
- Activation: It is a pressure-operated switch that is triggered when you press the brake pedal.
- Identification: You will see a wiring connector attached to the switch.
This video shows the location and removal process in detail: 58sTRQYouTube · Mar 27, 2025
What does a brake light symbol look like?
The brake light symbol on a dashboard typically appears as a circle with an exclamation mark, the letters "BRAKE," or "ABS" inside a circle, or a circle with dashed lines around it. These symbols can indicate several issues, such as a problem with the parking brake, low brake fluid, or worn brake pads. If you see a brake warning light, check your parking brake first, and then have the vehicle inspected by a professional, as brake system problems can be serious safety hazards.
This video explains the meaning of different brake warning lights: 40sPowerStop BrakesYouTube · Sep 14, 2023
Common brake light symbols and their meanings
- Red "BRAKE" or circle with an exclamation mark (!): This often indicates a problem with the hydraulic brake system, such as low brake fluid or a leak. It could also mean the parking brake is still engaged. This is a serious warning that requires immediate attention.
- "ABS" inside a circle: This light signifies that the anti-lock braking system (ABS) has a malfunction. While your standard brakes will still work, the ABS safety feature is disabled.
- Circle with dashed lines around it: This is a common symbol for worn-out brake pads. It means the pads need to be replaced soon.
- Circle with a "(P)" inside: This is the symbol for the parking brake. If the light stays on after you have fully disengaged the parking brake, it may indicate another problem with the brake system.
What to do if the brake light comes on
You can watch this video to learn how to reset the brake system warning light and what to do in different situations: 1mDashboard warning lights YouTube · Feb 29, 2024
- Check the parking brake: First, ensure your parking brake is completely disengaged.
- Check brake fluid: If the parking brake is off and the light is still on, check your brake fluid level. Low fluid often indicates worn brake pads or a leak.
- Consult your owner's manual: Your vehicle's manual will provide specific information about the symbols on your dashboard.
- Get a professional inspection: Since brake issues can be dangerous, it is crucial to have a professional mechanic inspect your vehicle as soon as possible.
- Drive with caution: If the light comes on and the brakes feel normal, you can typically drive carefully to a repair shop. If you notice a change in how your brakes feel, or if the light flashes, pull over safely and call for assistance.
How to check brake light switch?
To check a brake light switch, locate it near the top of the brake pedal, visually inspect it and its wiring for any damage, and then test its function. The most reliable method is to use a multimeter or test light to check for continuity or power, confirming the switch completes the circuit when the brake pedal is pressed and opens it when released.
Visual and basic checks
This video shows how to locate the brake light switch and check for a broken plunger: 46s1A Auto: Repair Tips & Secrets Only Mechanics KnowYouTube · Oct 12, 2020
- Locate the switch: Find the brake light switch mounted near the top of the brake pedal arm.
- Inspect for damage: Look for any obvious signs of damage to the switch or its wire harness.
- Check the stopper: Ensure the small plastic or rubber "stopper" on the brake pedal that activates the switch is still in place. If it's missing, the switch will not operate correctly.
- Check the lights: Have someone press the brake pedal while you watch the brake lights. If they don't work, it could be the switch, bulbs, or wiring.
Electrical testing with a multimeter or test light
This video demonstrates how to test a brake light switch with a test light and a multimeter: 0:58Top 5 Auto RepairsYouTube · Oct 15, 2024
- Turn the ignition to the "on" or "run" position.
- Disconnect the switch's wiring harness.
- Use a multimeter or test light: Set your tool to test for continuity (ohms) or to check for voltage.
- Test with the pedal up: With the brake pedal not pressed, the circuit should be open. There should be no continuity (or a low reading) on the multimeter and the test light should not turn on.
- Test with the pedal down: Press and hold the brake pedal to move the switch's plunger. Now, the circuit should be closed. There should be continuity (or a low resistance reading) on the multimeter and the test light should illuminate.
- Analyze the results:
- Good switch: The light is off when the pedal is up and on when the pedal is pressed.
- Bad switch: If there is no change, or if the light is always on or always off, the switch is likely faulty.
How do you turn on your brake light?
To turn on your brake lights, simply press the brake pedal. When you push the pedal, it triggers a switch that closes an electrical circuit, sending power to the rear brake lights. Releasing the pedal opens the circuit and turns the lights off.
How the brake lights work
- The switch: When you press the brake pedal, it contacts a switch. This switch is usually located near the top of the pedal arm, under the dashboard.
- Closing the circuit: The switch completes an electrical circuit, allowing electricity to flow to the brake light bulbs.
- Illuminating the lights: This surge of electricity causes the bulbs to light up.
- Turning off: When you take your foot off the brake pedal, the switch is released, the circuit is broken, and the lights turn off.
How to check if your brake lights are working
- Park your car in front of a light-colored wall or use a mirror to see the reflections.
- Press the brake pedal firmly.
- Check if the brake lights are illuminating on the rear of the car. For older cars, you may only see two lights; newer cars have a third, high-mounted light in the center.
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