Skip the auto shop - Our mechanics make house calls

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 1000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: How do I use the steering wheel to adjust the volume?

The steering wheel volume switches are located on the back of the steering wheel, on the right side. Using your right hand, feel behind the steering wheel for the volume switches. Press the top of the switch to increase the...

Q: How to remove the radio from 1989 Dodge W250

Hello, thank you for writing in. The bracket or panel that secures the radio into the dash has 5 screws that are located around the base of the panel. There is also one more screw above the radio connecting the...

Q: Car shuts off when driving it and power steering locks up what is the problem?

These vehicles have several common problems that may be causing your car to stall. However, in your case, it sounds like your ignition module may be losing spark when the vehicle gets warm while driving. After sitting for a while,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...