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Thread: Persistant "Brake Linings" warning

  1. #11
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    Jan 2006
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    Connecticut, USA
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    Have been having this problem also for the last couple years, I always assumed it was the line grounding out somewhere.

    How do you test the sensor for continuity? Will a test light work fine? Also, are there any other spots common for fraying besides the front struts?
    1990 Islandgrun 535iM Sedan

    3k oil changes | Euro lights + trim | Eibach/Bilstein | EAT Chip

  2. #12
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    Quote Originally Posted by ILoveMPower View Post
    Have been having this problem also for the last couple years, I always assumed it was the line grounding out somewhere.

    How do you test the sensor for continuity? Will a test light work fine? Also, are there any other spots common for fraying besides the front struts?
    Bulb and battery method is fine-all you are looking to confirm is that the circuit is complete. Just disconnect at the plug and put a probe on each of the terminals of the yellow lead. Bulb should light. If it doesnt, yellow wire or sensor are at fault. The thin yellow covered wires that go to the sensors could fail - mine did on one of the rears. Didnt look frayed but had broken inside somewhere. If it does light, you are looking for a break in the wiring going the other way. More likely at the front near the struts as the wiring moves with the angle of the wheels. HTH

  3. #13
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    Feb 2004
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    Just replace the sensor... it is that simple. You can test if that is problem by simply bypassing the sensor... stick a wire in both hole and tight... and if the warning sign go away, that is it.

    Factory skinny wire sensor break so easily.

  4. #14
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    Jan 2007
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    Brake sensor is a simple loop. Unplug sensor and check continuity across the two wires. If you have a light the sensor is good. No light sensor is bad.

  5. #15
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    continuity requires a DMM

  6. #16
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    Default light good... no light bad

    Sensor is really just a piece of wire. Continuity can be tested using a simple meter on ohms setting or with a couple pieces of wire, a bulb and a battery.
    Quote Originally Posted by ILoveMPower View Post
    Have been having this problem also for the last couple years, I always assumed it was the line grounding out somewhere.

    How do you test the sensor for continuity? Will a test light work fine? Also, are there any other spots common for fraying besides the front struts?

  7. #17
    Join Date
    Dec 2003
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    Eastern Tennessee USi
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    I posted this about 10 times, trace the wire in the front where it goes through the fenderwell and up. There is a tendancy for it to rub through the insulation. If you doubt the sensors twist the wires together and then do your testing through the fenderwell.
    95 E34 530I V2.37
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