You can replace a brake light bulb yourself in about 10 minutes with no tools

A brake light bulb burns out like any other bulb, and you can swap it out without a mechanic. The job takes a screwdriver or a coin — sometimes neither — and costs between $5 and $15 for the bulb itself. The hardest part is usually getting to the bulb housing inside your trunk or hatchback, not the replacement.

The process is the same whether you are replacing a single bulb or both: open the trunk, locate the housing, twist or unclip the assembly, pull out the old bulb, and push in the new one. The whole task is one of the few car repairs that genuinely does not require a shop visit.

Key Takeaways

  • Brake light bulbs cost $5 to $15 and are sold at auto parts stores, big-box retailers, and online — bring your vehicle's year, make, and model to get the right type.
  • Open your trunk and look for the plastic housing on the inside of the rear panel; it will have a wire or plastic clip holding it in place.
  • Twist the bulb socket counterclockwise or press the clip to release it, then pull the old bulb straight out and push the new one in until it clicks.
  • Test both brake lights by pressing the brake pedal while looking in a mirror or asking someone to watch the rear of the car.
  • If the new bulb does not light up, the issue may be a blown fuse or a wiring problem — not the bulb itself.

Find the right bulb before you start

Brake light bulbs are not all the same size or shape. Your vehicle's manual or the parts store will tell you which type you need, but the fastest way is to bring your car's year, make, and model to an auto parts store — staff can look it up in seconds and hand you the correct bulb.

You can also order online from retailers like Amazon, RockAuto, or AutoZone if you know the bulb type already. Common types include 1157, 1156, and 7440, but yours may be different. The bulb package will show you what it fits, so check that before you buy.

Locate the brake light housing inside your trunk

Open your trunk and look at the inside of the rear panel — the wall you see when you are standing behind the car with the trunk open. You will see one or two plastic housings, usually red or dark-colored, with wires or clips attached. These are the brake light assemblies.

If you cannot see them clearly, use a flashlight or your phone's light. The housing will be on both the driver's side and passenger's side of the trunk. If only one brake light is out, you only need to replace that side, but it is common to replace both at the same time since they wear at similar rates.

Remove the old bulb socket

Look at how the housing is held in place. Most cars use one of two methods: a plastic clip or a threaded socket. If you see a clip, press it inward or downward to release the housing. If the housing screws in, grip it firmly and turn it counterclockwise — it will come out in your hand.

Once the housing is loose, pull it toward you gently. You will see the bulb socket inside — it looks like a small plastic cartridge with the bulb sticking out. Grip the socket and twist it counterclockwise about a quarter turn. It will pop out. If it does not twist, it may pull straight out instead — try that if twisting does not work.

Install the new bulb

Pull the old bulb straight out of the socket. It should come free with gentle pressure. Do not force it. Now take your new bulb and push it into the socket until you hear or feel a click. The bulb should be seated firmly but not jammed.

Twist the socket clockwise to lock it back into the housing, or push it straight in if it does not twist. Then push the housing back into the trunk opening until the clip snaps or the threads tighten. You should hear a click or feel resistance when it is fully seated.

Test the brake light before you close the trunk

Sit in the driver's seat and press the brake pedal. Have someone stand behind the car and watch the brake light you just replaced, or use a mirror to see it yourself. The light should glow red when you press the pedal and turn off when you release it.

If the light does not work, the problem is usually not the bulb — it is more likely a blown fuse or a wiring issue. Check your vehicle's manual for the fuse box location and look for a blown fuse labeled "brake lights" or "stop lights." If the fuse is intact, the wiring may need professional attention.

Frequently Asked Questions

Do I need to disconnect the battery before replacing a brake light bulb?

No. Brake light bulbs run on low voltage and pose no shock risk. You can replace them with the battery connected and the car off. There is no need to open the hood or touch any electrical components.

What if the bulb socket is stuck and will not twist out?

explore gentle pressure and try rocking it side to side as you turn. If it is truly stuck, do not force it — you may crack the housing. Spray a small amount of penetrating oil like WD-40 around the socket, wait a few minutes, and try again. If it still will not budge, a mechanic can remove it without damage.

Can I use any bulb as long as it fits in the socket?

No. You must use the exact bulb type your vehicle requires. Using the wrong bulb can cause it to burn out faster, not fit properly, or draw too much power from your electrical system. The package will tell you which vehicles it fits — check that before you install it.

How often do brake light bulbs burn out?

Most brake light bulbs last between two and five years, depending on how often you drive and brake. There is no set schedule — you will notice when one goes out because the light will not work. Some vehicles have a dashboard warning light that alerts you to a burned-out bulb.

What if both brake lights are out at the same time?

If both bulbs burned out together, it is likely a coincidence — they wear at similar rates. However, if you replace both and they still do not work, the problem is probably a blown fuse or a wiring issue, not the bulbs themselves. Check the fuse box first before assuming the new bulbs are defective.