You can replace most brake lights in under 10 minutes with no special tools

A brake light replacement is one of the simplest car repairs you can do yourself. You reach into the back of your car from inside the trunk, unscrew a bulb socket, swap out the old bulb for a new one, and screw it back in. The whole job takes longer to find a parking spot than to finish it. You do not need a mechanic, a lift, or anything beyond a new bulb that costs $3 to $15.

The reason to do this yourself is speed and cost. A mechanic charges $50 to $150 for labor on a job that takes you five minutes. More importantly, a burned-out brake light is a safety issue — other drivers need to see when you are stopping — and a traffic stop waiting to happen. Replacing it the same day you notice it is worth the small effort.

Key Takeaways

  • Access the brake light from inside your trunk by locating the plastic socket behind the taillight assembly, which you twist counterclockwise to remove.
  • Buy a replacement bulb that matches your car's year, make, and model — the part number is printed on the old bulb or listed in your owner's manual.
  • Push the old bulb straight out of the socket, insert the new bulb, and twist the socket back into place until it stops.
  • Test both brake lights by pressing the brake pedal while looking in a mirror or having someone stand behind the car to confirm they light up.

Locate the brake light socket from inside your trunk

Open your trunk and look at the inside surface of the taillight panel on the side where the light is out. You will see a plastic socket protruding from the back of the taillight assembly. This socket holds the bulb and connects to the wiring. On most cars, you reach in and grab the socket, then twist it counterclockwise about a quarter turn until it stops. The entire socket — bulb, holder, and all — pulls straight out toward you.

Some cars have a different design where you remove a trim panel first or access the light from underneath the car. Your owner's manual shows the exact method for your model. If you cannot find the socket or the manual, a quick search for "[your year, make, model] brake light replacement" will show you a photo or video of the exact steps.

Buy the correct replacement bulb

The old bulb has a part number printed on its base — it looks like "7443" or "1156" or something similar. Write that number down and buy a new bulb with the same number. You can find these at any auto parts store, most supermarkets, and online retailers. They cost between $3 and $15 depending on the brand and whether you buy a single bulb or a pack.

If the old bulb is too damaged to read, your owner's manual lists the correct bulb type in the maintenance section. You can also call your car's dealership parts department with your vehicle identification number (VIN) and they will tell you the exact bulb to buy. Do not guess — using the wrong bulb can cause it to burn out faster, draw too much power, or not fit the socket at all.

Remove the old bulb and install the new one

Hold the socket in one hand. The bulb sits inside the socket and is held in by a straightforward push-fit or a slight twist. Most brake light bulbs push straight in and straight out — press gently on the bulb and it will pop out. Some bulbs twist a quarter turn counterclockwise before they come free. Check your manual or the old bulb's packaging to see which type yours is.

Once the old bulb is out, insert the new bulb into the socket. Push it straight in until you feel it seat, or twist it clockwise if it is a twist-fit bulb. Do not force it — it should slide in smoothly. Now push the entire socket back into the taillight assembly and twist it clockwise until it stops. You will feel it click or catch when it is fully seated.

Test the brake light before you drive

Sit in the driver's seat, press the brake pedal, and look in your side mirror to see if the light you just replaced is now on. If you have a second person, have them stand behind the car and watch both brake lights while you press the pedal. Both lights should glow red and turn off when you release the pedal. If the new light does not come on, the bulb may not be seated properly — pull the socket back out, reseat the bulb, and try again.

If the light still does not work after you have reseated the bulb twice, the socket itself may be damaged or there may be a wiring problem. At that point, a mechanic can diagnose the issue, but most of the time reseating the bulb solves it.

When to replace both brake lights at the same time

If one brake light is burned out, the other is probably getting close. Brake light bulbs wear out at roughly the same rate because they are the same age and get the same use. Replacing both at once means you will not have to go back into the trunk in a few weeks. It also costs almost nothing extra — you are spending five more minutes and $5 to $15 on a second bulb.

The exception is if one light burned out years ago and you are just now fixing it. In that case, the other light probably still has life left in it. Replace only the burned-out one and check the other one in six months.

Frequently Asked Questions

Can I drive with a burned-out brake light?

Legally, no — a burned-out brake light is a traffic violation in all states and you can be stopped by police. More importantly, it is a safety hazard because drivers behind you cannot see when you are stopping. Replace it the same day you notice it is out.

What if the bulb keeps burning out after a week?

A bulb that burns out repeatedly usually means the socket is damaged, the wiring is loose, or you are using the wrong bulb type. Check that you installed the correct part number. If it is correct, the socket or wiring needs professional inspection.

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

No. Brake light bulbs operate on low voltage and there is no risk of shock or damage. You can replace the bulb with the battery connected and the car on or off.

What is the difference between a brake light and a tail light?

A tail light is always on when your headlights are on. A brake light only comes on when you press the brake pedal. Some cars use a single bulb that does both jobs — it glows dimly as a tail light and brightly as a brake light. Check your owner's manual to see which type your car has.