- Step 1
Position your car in such a way that you can see the brake lights operating. A wall or garage door works best for this purpose, especially in the early evening, when the brake lights will be more visible and easier for you to check.
- Step 2
Press down on your brake pedal while looking at the rear window. You should be able to see the reflection of your brake lights on the wall behind you.
- Step 3
Observe how your brake lights operate. Make sure that both sides of the vehicle are equally lit from the illumination of the brake lights, and ensure that the resulting glow is not weighted in favor of one light over the other.
- Step 4
Troubleshoot any problems that arise as a result of your brake light check. Note any problems in a small notebook if you do not feel comfortable memorizing them.
- Step 5
Check the fuses for your brake lights. The owner's manual of your automobile should tell you exactly where the fuse case is, although if you lack an owners manual, the fuse case is usually found beneath the dashboard in the driver's side area. The cover of the fuse case will provide a diagram of what fuse is responsible for which system.
- Step 6
Change all necessary fuses. Using the fuse removal tool provided by most automobile manufacturers is the best way, however they can be removed using one's fingers as well. Make sure you replace the fuses only with a fuse of the same type!
- Step 7
Replace the brake light bulbs by opening the trunk and removing the panel that leads to the brake lights. This will be different for every automobile, but there is no trick to how it's done. In many modern automobiles, the brake light panel is attached with an easy-to-remove wingnut, but be prepared by keeping a screwdriver and ratchet handy.
- Step 8
Consult an auto mechanic if replacing fuses and light bulbs do not solve any problems you have with the brake lights. This means that the problem is located in the vehicle's electrical system and should be treated by professionals.