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Thread: Brake Ware Sensors

  1. #1
    Join Date
    May 2006
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    NH
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    Default Brake Ware Sensors

    How do they work? Do you see a message in the console or do i hear like a chirping/whistling sound from the wheel when the brakes are NOT employed?
    1995 540i Manual build 1/95

  2. #2
    Join Date
    Oct 2004
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    3,105

    Default When a fine wire

    imbedded in the plastic tip of the sensor gets worn away by the rotor and breaks the circuit open, it triggers the warning on the dash.

    If you want to see the warning, just unplug the sensor.


    Vee ave vays of dealing vid your kind...........

  3. #3
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    Default

    Good enogh. I heard some high pitched whisle sounded like it was coming from a rear wheel. It went away it seemed when i hit the brakes but after a minute it went away completely and didn't return,may have just been a wheel bearing groaning after i took an especially hard fast curve.
    1995 540i Manual build 1/95

  4. #4
    Join Date
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    Default

    say "brake wear" "brake wear" "brake wear" sensor. as Bob says, easy deal to replace, fronts with tires, rears need wheels removed for access.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  5. #5
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    Default

    Quote Originally Posted by 632 Regal
    say "brake wear" "brake wear" "brake wear" sensor. as Bob says, easy deal to replace, fronts with tires, rears need wheels removed for access.
    I almost bought a house in Ware,NH. I guess i never forgot the place.. This notwithstanding, how does replacing the sensor help unless i replace the pads too in which case i have to take the wheels off anyway...
    Last edited by Jehu; 08-23-2006 at 09:34 PM.
    1995 540i Manual build 1/95

  6. #6
    Join Date
    Aug 2006
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    Kansas City, MO
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    Default

    How those sensors work is..

    Basicly there is a circut which is not complete until you wear away the plastic with the caliper pushing it up against the rotor. The plastic wears off and the wires touch and make a complete circut which tells the dash to light up with "Brake Linings"

  7. #7
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    NH
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    Default

    So then you go look at your pads and judge if you want to change them or like to like dangerously?
    1995 540i Manual build 1/95

  8. #8
    Join Date
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    Default close, but no...

    the circuit is closed until the fine wire gets worn away by the rotor, and becomes open.

    That's why so many of us experiance false warnings from corrosion in the plug terminal.


    Vee ave vays of dealing vid your kind...........

  9. #9
    Join Date
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    Default

    they sometimes wear one side of the pad more than the other, you definetly should take a peek at them. I had no brake warning but the pass side was almost at metal to metal. Saved them rotors and was good to go.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  10. #10
    Join Date
    Oct 2004
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    Default That's the fun part

    there's only two sensors, one front one back.

    so, if you got uneven wear, you got trouble.


    Vee ave vays of dealing vid your kind...........

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