How to Check Your Car Brake Lights

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Brake lights are one of many important safety features we take for granted on our vehicles. Most vehicles are equipped with three brake lights: left, right, and center. The center brake light is typically known under different names: center-mount, high-mount, or even third brake light. Brake lights fail for many reasons, often because there's a burned bulb causing one or more brake lights to be inoperative. Other times the brake light system can have a complete failure of the brake lights.

Many vehicles do not have a “bulb out” indicator so it is important to walk around your vehicle on occasion and conduct a bulb inspection to be certain they are all functioning properly.

Part 1 of 2: Checking the brake light bulbs

Materials Needed

  • Fuses
  • Pencil with eraser top
  • Ratchet/socket set
  • Replacement bulb
  • Sandpaper

  • Tip: Gluing a small piece of sandpaper to the tip of a pencil eraser makes for easy cleaning of bulb socket contacts.

Step 1: Located burned bulbs. Have a friend step on the brake pedal while you observe the vehicle from the rear to locate which, if any, bulb is out.

Step 2: Remove the bulb. Some vehicles have easy access to the tail/brake light assemblies from behind, either inside the trunk or inside the trunk lid, depending on application. Others may require removal of the tail/brake light assembly. Access the bulb according to your vehicle.

Step 3: Replace the bulb. Once the bulb is removed, this is a good time to use the sandpaper-topped pencil eraser to clean the contacts in the bulb socket.

brake light bulb

Insert the new bulb. Have your friend apply the brakes before reinstalling the lamp assembly to verify operation.

Part 2 of 2: Checking the brake light fuses

Step 1: Check the fuses. Using your vehicle owner's manual, locate your brake light fuse. Many modern vehicles have more than one fuse box in different locations.

Step 2: Replace the fuse if blown. Fuses can sometimes blow simply due to age. If you find the fuse to the brake lights blown, replace it and check the brake lights. If the fuse remains good, then it may have simply blown due to age.

If the fuse blows again immediately or after a few days, then there is an electrical short in the brake light circuit.

  • Note: If your vehicle is blowing brake light fuses, there is a short in the brake light circuit that should be diagnosed by a professional.

It could be anywhere from the fuse box, to the brake light switch, wiring to the brake lights or even the brake/taillamp housing itself. Also, if your vehicle is equipped with LED brake lights, either all three or simply the center brake light and it is not functioning, the LED circuit itself may be defective, requiring replacement of that LED lighting assembly.

If replacing brake light bulbs has not resolved your issues, contact a professional mechanic, such as one from YourMechanic, to replace your brake light bulb or figure out why your brake lights aren't working.


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Pardeep

20 years of experience
652 reviews
Pardeep
20 years of experience
Ford Fusion - Brake Pads Replacement (Rear) - Fremont, California
Again 5 star service. And already scheduling him for my next appointment. Highly recommend Pardeep for your car needs.
Chevrolet Camaro - Brake Pads Replacement (Front) - San Jose, California
Great knowledgeable mechanic and fast great work. I will use Pardeep and your services again. Thank you

Theodore

15 years of experience
1137 reviews
Theodore
15 years of experience
Toyota Camry - Brake Pads Replacement (Front) - Everett, Washington
Theodore arrived on time, he did a great job replacing my brakes on my Camry, I will definitely work with him again.
Subaru Outback - Brake Pads Replacement (Front, Rear) - Renton, Washington
We have had previous work done by Theodore. Really appreciate his thoroughness and professionalism!

Matthew

32 years of experience
734 reviews
Matthew
32 years of experience
Jeep Wrangler - Brake Pads Replacement (Front) - Yorktown, Virginia
We've been using Your Mechanic services for a few years, for a few reasons. The convenience of having an expert mechanic "on-call," the great pricing and transparency for services (saving 10% - 25% at times), most of all Matt is our go-to guy who is highly qualified, knowledgeable in the work and knows how to explain it to us in detail.
Ford F-150 - Brake Pads Replacement (Front) - Newport News, Virginia
Matt's technical knowledge of his profession is incredible! He is prompt, thorough, friendly, professional, engaging, and completes the job to 100% perfection! Thank you, Matt for the most outstanding auto repair service in all my many years!!!

Jason

31 years of experience
162 reviews
Jason
31 years of experience
Nissan Altima - Brake Pads Replacement (Front) - San Mateo, California
Jason was very professional and friendly. He provided extremely honest and helpful advice on issues with my Altima that would require proactive future maintenance.

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