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 Brake Sensor Light Stay On 
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E30 Guy

Joined: Sat Aug 22, 2009 3:33 am
Posts: 49
Location: San Francisco, CA
Post Brake Sensor Light Stay On
My brake sensor light come on even though my brake pads are good. The strange thing is this is the third E30 I owed that have this problem. Does anybody have this problem or just me. Anybody have any idea how to fix this problem because it is beginning to irritate me. Thanks

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88 325i Convertible
87 325is


Sun Oct 04, 2009 12:21 pm
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Joined: Sat Sep 12, 2009 5:37 am
Posts: 136
Location: Denver and Dillon Lake, Kolorado
Post Re: Brake Sensor Light Stay On
I assume you checked the sensors, but most likely its the sensor wire which can get nicked, especially in the front where the wires are attached to the strut and alot of moving parts abound.

Unplug sensors at one wheel, but leave on the other three sensors. Start the car, and if that single sensor activates the light, its your problem sensor or wire. If it stays unlit, that sensor and wire is okay. Do this test to all four wheels.

Because this is a VERY common problem, tuners who work on their cars and have tried to fix this minor problem in vain, have also disconnected the brake lining light inside the instrument cluster since they know/or can easily check, the thickness of the pads themselves. Just take out the instrument cluster, go to Brake Lining light location, spin small light out of socket on back of instrument cluster (it has no wires attached to it, bulb connects off circuit board).

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Sun Oct 04, 2009 2:47 pm
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E30 Guy

Joined: Sat Aug 22, 2009 3:33 am
Posts: 49
Location: San Francisco, CA
Post Re: Brake Sensor Light Stay On
Thanks, Glen. I'll try it to see if it work but to my knowledge that are only two brake sensors, left front and right rear.

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88 325i Convertible
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Sun Oct 04, 2009 11:15 pm
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Joined: Sat Sep 12, 2009 5:37 am
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Location: Denver and Dillon Lake, Kolorado
Post Re: Brake Sensor Light Stay On
Sorry. Dah. Was thinking of ABS sensors not pad sensors...


Sun Oct 04, 2009 11:30 pm
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Joined: Fri Feb 27, 2009 5:17 pm
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Location: Appleton, WI
Post Re: Brake Sensor Light Stay On
Nah, it happens all the time. The wires get messed up or something.... Mine is on now, but that's because of two things....1, I don't have the sensors and 2, one of the wires got cut. You can fix this by soldering the two wire together to complete the circuit. I just haven't do that yet.

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Mon Oct 05, 2009 3:17 pm
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Joined: Fri Feb 27, 2009 5:17 pm
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Location: Appleton, WI
Post Re: Brake Sensor Light Stay On
Some people call me jaws....its because I can bite through steel cable.

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Mon Feb 15, 2010 3:41 pm
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