Replacing a brake light takes 15 to 30 minutes and costs $10 to $25 for the bulb

You can replace a brake light yourself without tools or a mechanic visit. The job involves reaching the light housing from inside your trunk or behind the bumper, twisting out the old bulb, and installing a new one that matches your car's specifications. Most people finish in under half an hour.

The hardest part is usually finding the right bulb type for your vehicle. Car manufacturers use different socket sizes and wattages depending on the year, make, and model. Buying the wrong bulb wastes money and leaves you with a non-functioning brake light.

Key Takeaways

  • Check your owner's manual or the bulb itself to find the correct replacement part number before you buy anything.
  • Most brake light bulbs are accessed from inside the trunk by twisting the housing counterclockwise, though some cars require bumper removal.
  • Wear gloves or use a clean cloth when handling the new bulb to avoid getting skin oils on the glass, which shortens bulb life.
  • Test your brake lights by pressing the pedal or asking someone to watch the rear while you brake before you consider the job done.

Locate the brake light housing on your vehicle

Open your trunk and look at the inner panel where it meets the rear bumper. You should see a plastic housing with wires attached — this is the brake light assembly. On most sedans and hatchbacks, you can access the bulb from inside the trunk without removing anything.

Some vehicles, particularly trucks and older cars, require you to remove the housing from outside. If you cannot reach the bulb from the trunk, check your owner's manual for whether the housing unscrews from the bumper or if the entire bumper needs to come off. Bumper removal usually requires a jack and takes longer than the bulb swap itself.

Find the correct replacement bulb

Look at your owner's manual in the section on bulb specifications, or search online for "[your year, make, model] brake light bulb." Common sizes are 1157, 1156, 7443, and 7440, but yours may differ. Write down the part number before you go to the store.

You can also remove the old bulb and check the number printed on its base. Take it with you to an auto parts store and ask for an exact match. The staff can confirm the wattage and socket type in seconds. Buying the wrong size means the bulb will not fit or will not light properly.

Remove the old bulb and install the new one

Twist the plastic housing counterclockwise (or clockwise, depending on your car — try both directions gently) until it comes free. The entire assembly should slide out toward you. Do not pull hard; if it does not move, you are twisting the wrong direction.

Once the housing is out, locate the bulb socket inside. It will be a plastic or ceramic base with the bulb pushed into it. Push the bulb in slightly and twist it counterclockwise to release it. It should come out easily.

Insert the new bulb into the empty socket and twist clockwise until it stops. Do not force it. Wear clean gloves or use a paper towel when handling the new bulb — skin oils can damage the glass and shorten its life. Slide the housing back into the car and twist it clockwise until it is snug.

Test the brake light before finishing

Sit in the driver's seat and press the brake pedal while looking in a mirror or asking someone to stand behind the car and watch the light. It should glow red when ready. If nothing happens, the bulb may not be seated correctly — remove the housing and reseat the bulb with a quarter-turn more pressure.

If the light still does not work after reseating, the bulb may be defective or you may have installed the wrong type. Return to the auto parts store with the bulb and ask them to test it. If the bulb is good but still does not light, the issue is likely a wiring or fuse problem that requires a mechanic.

When to replace both brake lights at the same time

If one brake light is out, the other is probably aging too. Bulbs of the same age often fail around the same time. Replacing both now means you will not have a second brake light burn out a week later and have to repeat the job.

The cost difference is minimal — one bulb versus two is usually $5 to $10 more — but the convenience is significant. Many people replace both and never think about brake lights again for years.

Frequently Asked Questions

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

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 remove any fuses. Just make sure the car is parked and the engine is off before you start.

What if the housing is stuck and will not twist out?

Stop twisting when ready — forcing it can crack the plastic. Try twisting in the opposite direction; you may have been turning the wrong way. If it still will not budge, spray a small amount of penetrating oil around the seam and wait 10 minutes. Twist gently again. If it remains stuck, the housing may need professional removal.

Can I use a different wattage bulb if the correct one is not in stock?

No. Using the wrong wattage can damage the wiring, blow a fuse, or cause the light to be too dim or too bright. Wait for the correct bulb or order it online. Auto parts stores usually have most common sizes in stock within a day.

How long does a brake light bulb usually last?

Most brake light bulbs last between two and five years, depending on how often you brake and the quality of the bulb. LED brake lights last longer — sometimes 10 years or more — but cost more upfront. Standard incandescent bulbs are cheaper but burn out sooner.

Is it illegal to drive with a brake light out?

Yes, in all states. A burned-out brake light is a traffic violation and a safety hazard. Police can stop you for it, and you may receive a ticket. Replace it as soon as you notice it is out.