Skip the auto shop - Our mechanics make house calls

Q: My car needs a brake sensor or brake fluid.

asked by on

Brake light comes on intermittently. As per investigation online, it could be the brake fluid or it needs a new brake sensor.

A: There are only three things that can trigge...

There are only three things that can trigger a brake light on most vehicles and four if you own a BMW. The brake light can be triggered by either low brake fluid, dysfunctional parking brake engagement (or issue with the parking brake switch), or if the pressure differential switch has noticed a pressure differential between the two sides of your split brake system. BMW vehicles have a brake pad sensor which will also trigger the brake light when the pads get too thin. I would recommend having your vehicle inspected for brake issues. The most common causes for the red brake light would be low brake fluid and issues with the parking brake switch.

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・Save up to 30%

Get a quote

What others are asking

Q: How safe is it to drive with a torn caliper boot?

Hello, thanks for writing in to YourMechanic. If the caliper boot is torn open then you will get dirt, debris, water, and road salts in the caliper piston surface. The caliper may seize or tear the caliper piston seal causing...

Q: Front end shudder, CEL and 4LO lights on

Hey there. You need to have the AWD system checked to see why the light is 4LO. This can be an internal problem in the transmission transfer case lock up. This transfer case uses an electronic clutch that can shutter...

Q: I have power to my coil packs but I am not getting any spark

If you scan the computer and monitor the crankshaft and camshaft sensors, you will see one of them not working properly to send a signal that the computer will use to make the coils send a spark. You will not...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.