Q: My third break light comes on when I apply the brake pedal, but my two main brake lights dont

asked by on

I have checked all fuses, Changed all bulbs, not sure what else to do. I thought it might be the brake switch by the pedal but my third brake light come on when I push the brakes

My car has 105000 miles.
My car has an automatic transmission.

Hello. Thank you for writing in. The working brake light is known as the center high mount stop lamp. It is wired differently from the normal brake lights in order to prevent them from all going out at once. The normal tail lights are wired through something called the combination or multi-function switch. You should test you blinkers as they are wired through the same switch. It is likely this switch that has failed, and it will need to be replaced. If this is not the cause, further testing with a voltmeter must be done to find where the voltage supply that is supposed to power the bulbs is being cut off.

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. My third break light comes on when I apply the brake pedal, but my two main brake lights dont

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: does a cracked exhaust manifold cause oil to leak

A damaged exhaust manifold does not affect engine oil consumption. Of serious concern though is the possibility that the cracked manifold is leaking exhaust gas (including poisonous carbon monoxide) into the passenger cabin, typically through the firewall and vents. If...

Q: Q: Engine idle fluctuates

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Q: How Does a Car's Light Bulb Wiring Get Damaged?

There are many factors to consider when dealing with damaged light bulb wiring both physical and heat related causes can be a concern. The location where the bulb is installed or the actual routing of the wiring to the bulb...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.