Q: Brake lights stay on all the time.

asked by on

My brake lights stay on all the time. Running or not. I replaced the brake booster recently. (Twice) I checked the brake light switch. It works. Adjusted it to as close as it would go to the brake pedal. Checked the calipers for leaks. Bled the system. Bled the master cylinder.
Checked the hose from the the vacuum pump. Not with a gauge though. Seemed to be pulling good vacuum. Checked all vacuum hoses for leaks. Pulled the low vacuum sensor. At first the brake lights went off. Now, no effect when I remove it. I have to disconnect the battery when I'm not driving it. .

My car has 110000 miles.
My car has an automatic transmission.

Hi there. The most likely cause for the brake lights staying on is, a faulty brake light switch. Another possibility, would be a short to power past the brake light switch and disconnecting the brake light switch would isolate whether, the short to power is past the switch. Circuit tests should be performed to prove the diagnoses and avoid unnecessary repairs. I recommend having your vehicle’s brake lights stay on be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
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 stay on all the time.

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: My Cadillac Seville does not stay on after I start it

This is likely related to a fuel supply issue due to the fact that it requires starter fluid to stay running. I would begin by checking the fuel pressure after replacing the fuel pump to be sure it is getting...

Q: 01 dodge neon has no power to go, sputtering and wants to die

Smelling gasoline on your dipstick is not a good thing, and neither is the buildup of soot on your spark plugs. It sounds like you may have internal engine damage like a cracked or severely worn piston rings. I suggest...

Q: changed the fuel pump on 1999 dodge ram 2500 diesel fuel truck. Now, it doesn't send power to fuel pump.

At key on, the fuel pump is normally only powered momentarily to pressurize the system. If you are testing during this brief interval, you have to apply a volt meter at the instant the key is turned on. Otherwise, the...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...