You can replace a brake light bulb yourself in most cars without tools or special knowledge
A brake light bulb burns out like any other bulb, and replacing it takes about ten minutes. You do not need a mechanic. The process is the same across most vehicles: access the light housing from inside the trunk or behind the bumper, twist out the old bulb, and push in a new one. The hardest part is usually finding the right bulb type for your car, which you can look up in your owner's manual or by the part number already printed on the housing.
The only real risk is buying the wrong bulb. Brake lights use specific bulb sizes — usually 1157, 1156, or 7443 — and using the wrong one means it will not fit or will not light properly. Before you start, confirm which bulb your car needs. Once you have the right bulb, the job is straightforward enough that you can do it in a parking lot if a light burns out while you are driving.
Key Takeaways
- Find your bulb type by checking your owner's manual, looking at the part number on the housing itself, or asking an auto parts store for your car's year, make, and model.
- Access the light housing from inside your trunk (most common) or by removing a panel behind the bumper, depending on your vehicle design.
- Twist the bulb holder counterclockwise to remove it, then push the old bulb straight out and replace it with the new one.
- Test the brake light before you close the trunk or reinstall any panels to confirm the new bulb works.
Locate the correct bulb type before you start
Open your owner's manual and search for "brake light bulb" or "light bulb specifications." The manual will list the bulb size — usually a number like 1157, 1156, 7443, or 3157. Write this number down or take a photo of the page.
If you do not have the manual, look at the brake light housing itself. Most housings have the bulb part number printed on the plastic. You can also visit an auto parts store with your car's year, make, and model, and the staff will tell you which bulb you need. Buy two bulbs if you can — brake lights burn out in pairs sometimes, and having a spare saves a second trip.
Access the light housing from inside the trunk
Open your trunk and look at the inside wall where the brake lights are mounted on the outside. You will see either a large plastic panel or individual bulb holders protruding inward. On most sedans and hatchbacks, you will see a panel with two or three round holes.
If your car has a removable panel, look for clips or screws holding it in place. Unclip or unscrew it — usually two or three fasteners — and set it aside. If your car has individual bulb holders that stick through the trunk wall, you can access them directly without removing anything. On some trucks and SUVs, you may need to remove a panel from behind the bumper instead; check your manual if you cannot find the housing from inside the trunk.
Remove the old bulb and install the new one
Locate the bulb holder that corresponds to the brake light that burned out. The holder is a plastic cylinder with the bulb inside. Grasp it firmly and twist it counterclockwise — usually a quarter turn is enough — until it comes free. Do not pull straight out; twist first.
Once the holder is out, look at the bulb inside. It is held in by a straightforward push-fit connection. Push the bulb straight in toward the holder, then twist it counterclockwise a quarter turn and pull it straight out. Insert the new bulb by pushing it straight in, then twist it clockwise a quarter turn until it seats. The bulb should not wiggle or come loose.
Reinsert the bulb holder into the housing by aligning it and twisting clockwise until it stops. You will feel it click or seat firmly. Do not force it; if it does not turn smoothly, you may have it slightly misaligned. Twist it back out and try again.
Test the brake light before you finish
Before you close the trunk or reinstall any panels, have someone press the brake pedal while you watch the light from outside the car. If the new bulb lights up, you are done. If it does not, the bulb may not be seated correctly — remove the holder, check that the bulb is pushed all the way in and twisted clockwise, and try again.
If the light still does not work after you have reseated the bulb twice, the bulb itself may be defective. Swap it for the second bulb you bought, or return it to the auto parts store for a replacement. Once the light works, reinstall any panels you removed and close the trunk.
What to do if you cannot access the housing
Some vehicles — particularly older trucks and some luxury cars — have brake light housings that are difficult to reach from inside the trunk. If you cannot find the bulb holder after five minutes of looking, check your owner's manual for the exact location and access method. The manual will have a diagram showing where to look.
If the manual says you need to remove the bumper or a large panel, and you do not feel confident doing that, this is the point to take the car to a mechanic. The labor cost is usually $30 to $75, which is reasonable if the alternative is an hour of frustration. A brake light bulb is not a safety risk if it is burned out — you still have the other side — so there is no urgency to do it yourself if the access is awkward.
Frequently Asked Questions
Can I use any bulb as long as it fits in the holder?
No. Brake light bulbs are rated for specific brightness and electrical draw. Using the wrong bulb type can cause it to burn out when ready, not light at all, or draw too much power and blow a fuse. Always use the exact bulb type listed in your manual or printed on the housing.
Do I need to disconnect the battery before changing a brake light?
No. Brake light bulbs operate on low voltage and pose no shock risk. You do not need to disconnect anything. Just make sure the engine is off and the trunk is open for light.
What if one brake light works but the other side is burned out?
Replace the burned-out one. Brake lights come in pairs, but they burn out independently. You only need to replace the bulb that is not working. However, if both bulbs burned out at the same time, check whether a fuse has blown — if so, replacing the bulbs will not help until you replace the fuse.
How long does a brake light bulb usually last?
Most brake light bulbs last between 200 and 1,000 hours of use, which translates to several years for most drivers. The exact lifespan depends on how often you brake and the bulb quality. LED brake lights last significantly longer than traditional incandescent bulbs.
Is it safe to drive with one brake light out?
It is legal to drive with one brake light out in most places, but it reduces visibility to drivers behind you. Replace it as soon as you can. Many states will issue a citation if both brake lights are out, so do not delay if the second one burns out soon after the first.