Brake light installation is a task most owners can handle in 30 minutes to an hour, using only basic tools
A brake light that works tells other drivers you are slowing down. When one burns out, replacing it is usually straightforward: you remove the lens or taillight assembly from inside the trunk or hatch, pull out the old bulb, insert the new one, and reassemble. The exact steps depend on your vehicle's year, make, and model — some cars have a single bulb socket you access from inside the trunk, while others require removing the entire taillight housing from the outside.
Before you start, check your owner's manual or search your vehicle's year and model online to see whether your brake light is accessed from inside or outside the vehicle. This determines which tools you need and how much of the taillight assembly you have to remove. Most vehicles use a straightforward twist-and-pull motion to remove the bulb socket, but some require a screwdriver or a plastic panel removal tool.
Key Takeaways
- Brake light bulbs are accessed either from inside the trunk or by removing the taillight housing from outside, depending on your vehicle design.
- You will need the correct replacement bulb type for your vehicle — check your owner's manual or the existing bulb for the part number.
- Most bulb sockets twist counterclockwise to remove; do not force them, as the plastic can crack.
- Test the new bulb before closing up the assembly by turning on the ignition and pressing the brake pedal.
Locate the taillight assembly and determine your access point
Open your trunk or hatch and look at the inside wall where the taillight sits on the outside of the vehicle. You should see either a plastic panel with a bulb socket visible behind it, or a series of bolts or screws holding the taillight housing in place. If you see a panel with a socket, you can access the bulb from inside. If you see only bolts or screws from the inside, you will need to remove the housing from outside.
For vehicles with interior access, look for a plastic panel that may be held in by clips or a single screw. Gently pry it away or unscrew it. For vehicles requiring exterior removal, you may need to open the taillight housing by removing bolts with a socket wrench or screws with a screwdriver. Some newer vehicles have a quick-release tab or lever inside the trunk that you pull to pop the housing out from the outside.
Identify the correct bulb type and purchase a replacement
The bulb socket will have a label or number printed on it, or you can check your owner's manual under "Bulb Specifications" or "Lighting." Common brake light bulbs are 1157 (dual-filament, used for brake and running lights), 1156 (single-filament, brake only), or 7443 (wedge-base). Write down the number before you go to the parts store, or take a photo of the socket label.
Brake light bulbs cost between $3 and $15 depending on type and brand. Standard incandescent bulbs are cheapest; LED replacements cost more but last longer. Make sure the replacement is rated for your vehicle's voltage — most cars use 12-volt bulbs. If you are unsure, show the parts store employee a photo of your socket or tell them your vehicle's year, make, and model.
Remove the old bulb and install the new one
Once you have access to the bulb socket, grasp it firmly and turn it counterclockwise — usually a quarter turn is enough to release it. Do not twist hard; if it does not move easily, stop and check that you are turning the right direction. Pull the socket straight out toward you. The bulb will either be pressed into the socket or held by a wire clip.
If the bulb is pressed in, grasp it and pull straight out. If it is held by a clip, lift or slide the clip to release it. Insert the new bulb by pressing it straight in until you hear or feel a click, or until the clip snaps back into place. Do not touch the glass of an incandescent bulb with your bare fingers — oils from your skin can cause it to overheat and fail. If you do touch it, wipe it clean with a lint-free cloth.
Test the brake light before reassembling
Before you close up the taillight assembly, test the new bulb. Have someone sit in the driver's seat and press the brake pedal while you watch the light you just installed. It should glow red and match the brightness of the other brake light. If it does not light up, remove the bulb and check that it is fully seated in the socket. If the other brake light is dimmer than this one, that bulb may also be failing and should be replaced.
If the new bulb still does not work, the socket itself may be corroded or damaged. Look inside the socket for white or green corrosion, or for a broken wire. If you see corrosion, you can try cleaning it with a small wire brush or electrical contact cleaner. If the socket is cracked or the wire is broken, the socket will need to be replaced — this is a more involved repair that may require a mechanic.
Reassemble the taillight housing or panel
Once the bulb is confirmed working, reinsert the bulb socket into the housing by turning it clockwise until it stops. Do not overtighten — a snug fit is all that is needed. If you removed a plastic panel from inside the trunk, slide it back into place and find any clips or screws. If you removed the taillight housing from outside, line up the bolt holes and tighten the bolts or screws in a crisscross pattern to may support even pressure.
Close the trunk or hatch and test the brake light one more time from outside the vehicle to confirm it is working. Check that the taillight housing sits flush against the vehicle body and that no water can enter around the edges. If the housing is not seated properly, remove it and check for debris or misaligned clips, then reinstall.
Troubleshooting if the new bulb does not work
If you installed a new bulb and it still does not light, the problem is usually a corroded socket, a blown fuse, or a wiring issue. Check your owner's manual for the location of the fuse box and look for the brake light fuse — it is often labeled "STOP" or "BRAKE." If the fuse is blown (the wire inside will be broken or blackened), replace it with one of the same amperage rating. Fuses cost less than $1.
If the fuse is good and the bulb is new, the socket or wiring may be damaged. Corrosion inside the socket is common in older vehicles or those exposed to salt or moisture. You can try cleaning the socket with electrical contact cleaner and a small brush, but if that does not work, the socket assembly will need to be replaced by a mechanic or a dealership. This repair typically costs $50 to $150 in labor plus the cost of the socket.
Frequently Asked Questions
Can I use an LED bulb in place of an incandescent brake light?
Yes, as long as the LED bulb is rated for your vehicle's voltage and socket type. LED bulbs are brighter and last much longer, but they cost more upfront. Some older vehicles have wiring that does not work well with LEDs, so check your owner's manual or ask a parts store employee whether an LED replacement is recommended for your model.
What if I cannot access the bulb from inside the trunk?
You will need to remove the taillight housing from outside. Look for bolts or screws on the back of the housing and remove them with a socket wrench or screwdriver. Some housings are held by clips and can be pried out gently with a plastic panel removal tool. If you are unsure how to remove it, search your vehicle's year and model on YouTube — most removals are shown in short videos.
How often do brake light bulbs burn out?
Incandescent brake light bulbs typically last 500 to 1,000 hours of use, which is usually 1 to 3 years depending on how much you drive and brake. LED bulbs last 10,000 to 50,000 hours or more. If a bulb burns out within a few months of installation, the socket may be corroded or the vehicle's electrical system may be overcharging the bulb.
Do I need to disconnect the battery before replacing a brake light?
No. Brake light bulbs operate on low voltage and pose no shock risk. You do not need to disconnect the battery or turn off the ignition. However, make sure the vehicle is parked on level ground and the parking brake is set before you open the trunk or hatch.
What if both brake lights are out?
If both bulbs burned out at the same time, replace them both. If one bulb is new and the other burned out quickly, check the fuse and the vehicle's charging system — an overcharging alternator can burn out bulbs prematurely. If the problem continues after replacing both bulbs and the fuse, have a mechanic inspect the electrical system.