You can replace a brake light bulb yourself in 10 to 15 minutes with no tools
A brake light bulb burns out like any other bulb, and you can swap it out without a mechanic. The process is straightforward: access the light housing from inside your trunk, twist out the old bulb, and insert a new one. Most cars use the same bulb type for all three brake lights (two on the rear, one on the high-mounted center brake light), though some older vehicles vary.
The hardest part is usually finding the right bulb type for your car. Once you have it, the replacement takes minutes. You do not need special tools, a lift, or any mechanical knowledge.
Key Takeaways
- Open your trunk and locate the brake light housing on the inside of the rear panel — you will see a plastic cover or assembly with wires attached.
- Twist the bulb socket counterclockwise (usually a quarter turn) to remove it from the housing, then pull the old bulb straight out of the socket.
- Find your car's correct bulb type by checking your owner's manual or the label inside the trunk lid, then buy a replacement at any auto parts store.
- Insert the new bulb into the socket, twist the socket clockwise back into the housing, and test the brake lights by pressing the brake pedal while someone watches the rear.
Locate the brake light housing inside your trunk
Open your trunk and look at the inner wall on the driver's side and passenger's side near the rear corners. You will see a plastic assembly with wires running to it — this is the brake light housing. On some cars it is a single large panel; on others it is a smaller round or rectangular unit. The housing sits just behind where the brake lights are mounted on the outside of the car.
If you cannot find it when ready, check your owner's manual for a diagram. Many manuals show exactly which panel to access. You may also see a label inside the trunk lid listing the bulb type and wattage — write this down or take a photo.
Remove the old bulb from the socket
Grasp the plastic bulb socket (the part the bulb sits in) and twist it counterclockwise. Most sockets turn about a quarter turn before they release. You will feel it loosen and then come free from the housing. Do not force it — if it is stuck, try twisting gently in both directions to break it loose.
Once the socket is out, look at the bulb inside it. The bulb sits in the socket with two small pins or a bayonet fitting (a single pin with a notch). Pull the bulb straight out toward you. It should come free with light pressure. If it is stuck, wiggle it gently side to side as you pull.
Identify the correct replacement bulb type
Brake light bulbs come in several standard types, most commonly 1157, 1156, 7443, or 7440. The easiest way to find yours is to check your owner's manual — it will list the bulb type and wattage for each light. If you do not have the manual, look for a label inside the trunk lid or on the back of the light housing itself.
You can also take the old bulb to any auto parts store and ask them to match it. They will identify the type and sell you a replacement for $3 to $8. Buy a bulb rated for the same wattage as the original — using the wrong wattage can dim your lights or blow a fuse. Some people buy LED brake light bulbs as a brighter, longer-lasting alternative, though these cost more ($15 to $25) and may not fit all housings.
Insert the new bulb and find the socket
Hold the new bulb by its base (not the glass) and insert it into the socket. Push it in straight until you feel it seat fully. The bulb should sit flush with the socket opening. If it does not go in smoothly, check that the pins or bayonet fitting are aligned correctly with the socket slots.
Once the bulb is seated, grasp the socket and twist it clockwise back into the housing. You will feel it click or catch as it locks into place. Turn it until it is snug but do not over-tighten — a quarter turn is usually enough. The socket should sit flush with the housing when fully installed.
Test the brake lights before you finish
Close the trunk and have someone stand behind the car while you press the brake pedal. The new brake light should illuminate brightly and match the brightness of the other brake lights. If it does not light up, open the trunk and check that the socket is fully seated in the housing and the bulb is fully inserted into the socket.
If the light still does not work, the socket itself may be damaged or corroded, or there may be an electrical issue with that circuit. In that case, take the car to a mechanic — a faulty socket or wiring is beyond a straightforward bulb replacement. If all three brake lights work, you are done.
Frequently Asked Questions
Do I need to disconnect the battery before replacing a brake light bulb?
No. Brake light bulbs operate on a low-voltage circuit and are safe to handle while the battery is connected. You do not need to turn off the engine or disconnect anything.
What if the bulb socket is stuck and will not twist out?
Try twisting gently in both directions to break the corrosion or debris loose. If it is still stuck, spray a small amount of penetrating oil (like WD-40) around the socket seam, wait a few minutes, and try again. Do not force it hard enough to crack the plastic housing.
Can I use a different bulb type or wattage than the original?
No. Always use the exact bulb type and wattage listed in your owner's manual. Using a higher wattage can overheat the socket and melt the plastic housing. Using a lower wattage will make the light too dim for safety.
Why is my new brake light dimmer than the other lights?
The most common cause is a bulb that is not fully inserted into the socket. Open the trunk, remove the socket, and push the bulb in until it seats completely. If it is already seated, the socket may be corroded inside — try removing and reinserting the bulb a few times to clean the contacts.
How often do brake light bulbs burn out?
Brake light bulbs typically last 500 to 1,000 hours of use, which translates to several years for most drivers. LED bulbs last much longer, often 10,000 hours or more, but cost more upfront.