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Brake pedal position sensor - what does it do?

posted by  someone claiming to be Peter on  Sun Aug 6 12:21 CST 2006 [RELATED]

During a recent dealer visit, they reported a code from the brake position sensor. I couldn't see any point in having them replace it, since I am not having a problem with the brakes or brake lights.

Anyone know what this sensor does? I suspect that it may be the cuase of the cruise control switch off every once in a while, but I use the cruise control so rarely, I don't actually care. Does this sensor have any other function?








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    Brake pedal position sensor - what does it do?

    posted by  kshaw on  Mon Aug 7 13:40 CST 2006
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    last visit: Wed Oct 29 13:11 CST 2008
    [RELATED]

    It is probably also used for the black box built into most of the newer cars. I don't know to what extent it is used on the Volvo but I have seen it used in court as evidence to indict a driver. The black box records the last few seconds of events right before deployment of the air bag. Records speed, time and speed at which the brake was applied, and some record whether the passengers/driver were wearing seat belts. This device may have some safety benefits, but the intrusion aspect is scary. The particular case had the driver testifying to driving at the speed limit but the black box, which showed a much higher speed, was used to refute the driver's testimony.

    Another possible use is to prevent engagement of the automatic transmission until the brake is activated.
    --
    1998 Volvo S70








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    Brake pedal position sensor - what does it do?

    posted by  KlausC on  Sun Aug 6 15:50 CST 2006
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    last visit: Fri Oct 24 10:15 CST 2014
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    Depends on the year and model. The sensor will detect if the brake peddle is applied and turn off the cruise. It can easily be fixed by lowering the contact point about 1/2mm. The dealer will replace the sensor for around $150+

    Klaus
    --
    (V♂LV♂s 1995 854T, 1998 V70R)







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