How do I know which brake light bulb I need?

Check your owner's manual. It'll list the exact bulb number. Common ones are 3157, 7443, and 1157. You can also pull the old bulb out and read the number printed on the base. Or just use our vehicle finder to look it up by year, make, and model.

Can I replace a brake light bulb myself?

Yes. On most vehicles it takes under 15 minutes and requires no tools at all. You access the bulb from inside the trunk or behind a panel near the tailgate. Twist the socket out, swap the bulb, twist it back in. That's it.

Why does my new brake light bulb keep blowing?

If you're burning through bulbs quickly, you might have a wiring issue or a corroded socket. Water getting into the housing is another common cause. Check the socket for green or white buildup and clean it with electrical contact cleaner. If that doesn't fix it, there could be a voltage problem that needs a multimeter to diagnose.

Is it legal to drive with a broken brake light?

No. Every state requires working brake lights. You can get pulled over and ticketed for a burnt out brake light. Fines typically range from $25 to $150 depending on the state. More importantly, the car behind you can't tell when you're stopping.

Do I need to replace the whole tail light assembly for a brake light?

Usually no. If the lens isn't cracked or damaged, you just replace the bulb. It costs $3 to $10 instead of $30 to $150 for a full assembly. Only replace the full assembly if the housing is cracked, has water damage inside, or if the mounting tabs are broken.

How to Replace a Brake Light Bulb (Step by Step)

This is one of the easiest car repairs you'll ever do. No tools needed on most vehicles. Ten minutes, a $5 bulb, and you're done.

What You'll Need

New brake light bulb (matched to your exact year, make, and model)
Phillips head screwdriver (only if your vehicle has a fastened access panel)
Clean cloth or gloves
10 to 15 minutes of your time

Step by Step Instructions

Open the Trunk or Tailgate

Pop your trunk, tailgate, or liftgate. On most cars, trucks, and SUVs, you'll reach the brake light from inside the cargo area. Look for the back of the tail light housing behind the trunk lining.

Remove the Access Panel

Pull back the trunk carpet or pop off the plastic panel behind the tail light. Some vehicles have thumbscrews you can turn by hand. Others use push-pin clips that pry out with a flathead screwdriver or your fingers.

Find the Brake Light Socket

You'll see a few bulb sockets plugged into the back of the tail light assembly. Not sure which one is the brake light? Have someone press the brake pedal while you watch. The socket that lights up is the one you need. On most vehicles, it's the top or middle one.

Remove the Old Bulb

Twist the bulb socket counterclockwise about a quarter turn and pull it straight out of the assembly. Then remove the old bulb from the socket. Most brake light bulbs are bayonet style. Push down gently and twist counterclockwise to release.

Install the New Bulb

Push the new bulb into the socket and twist clockwise until it clicks into place. Make sure it seats firmly. If you're using a halogen bulb, don't touch the glass with your bare fingers. The oils from your skin create hot spots that shorten the bulb's life.

Reinstall the Socket

Push the socket back into the tail light assembly and twist clockwise to lock it in. It should sit flush with the housing. If it doesn't lock, make sure you're aligning the tabs correctly.

Test the Brake Light

Have someone step on the brake pedal while you check from behind the car. The light should come on bright and steady. While you're at it, test the running lights and turn signals too. Once everything checks out, put the access panel back and close the trunk.

Tips and Common Gotchas

Replace both sides while you're in there. If one brake light burned out, the other one is probably close behind. Bulbs are cheap. Doing both now saves you from doing this again in a month.
Check the socket for corrosion. If the socket contacts look green or crusty, clean them with fine sandpaper or electrical contact cleaner before installing the new bulb. A corroded socket will kill the new bulb faster.
Double check the bulb number. Brake lights and turn signals often use different bulbs even though the sockets look similar. A 3157 and a 3156 look almost identical but aren't interchangeable. Always match the number exactly.
Third brake light is different. The center brake light (mounted on the trunk lid or rear window) usually has its own separate bulb and access point. Check your owner's manual for that one since the removal method varies a lot between vehicles.

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