Q: Brake lights don't work after replacing brake pedal switch

asked by on

The brake lights won't work, but the blinkers, hazard, and running lights work. And the brake light on the back of the cab works. I replaced the brake pedal switch, but still no brake lights.

I can personally understand how frustrating it can be to try to get your brake lights working properly, and it looks like you have already put in a lot of effort to have it fixed! Having the information about your GMC Sierra’s other lights, including whether or not the brake lights on the cab are working properly, is very useful to help us tackle this problem. The working brake light on the cab informs me that the brake light switch is in fact working and that your Sierra may have a problem with the light bulbs themselves. Some bulbs are multi functioning and have two filaments inside of them. This allows the bulb to be both a tail light and a brake light at the same time and often times I have seen, only one will break. If you are comfortable tinkering with the bulbs on your GMC Sierra, I recommend going ahead and moving forward with replacing these bulbs and rechecking the brake lights to see if that addresses your concern. If for some reason the brake lights are still unable to work after replacing the bulbs, then I would highly recommend enlisting the assistance of a certified mechanic to properly diagnose why your brake lights aren’t working.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Brake lights don't work after replacing brake pedal switch

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Transfer case or transmission

Hi there. If you're hearing a whining noise from the transfer case area, odds are there is either physical damage inside the case or perhaps it is experiencing lubrication issues. In some instances, a damaged inner seal will cause excessive...

Q: I have 18 inch rims on my truck and was wondering if a set of 35/1250r18 would work without scrubbing i have a 3 inch body lift on

They will most likely not fit without trimming the metal. I think you will not be able to go bigger than 32/1150 without trimming. It will also depend on the type of tread on the tires. Some of those knobby...

Q: Can't stop when pressing the brake pedal

It sounds as though your brake booster, which facilitates power assist, is not operating. The brake booster operates from the engine vacuum; if the engine vacuum is leaking somewhere, then the power assist will not work, and your engine will...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.