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Thread: Rock hard break pedal

  1. #1

    Rock hard break pedal

    What would cause this. When i put my foot on the pedal its rock hard car will stop slowly.

    Is it the master cylinder that would cause this?

  2. #2
    BMWHaus Contributor
    Join Date
    Jul 2014
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    301

    RE: Rock hard break pedal

    A spit in your vacuum hose or failed vacuum pump would cause rock hard pedal

  3. #3

    RE: Rock hard break pedal

    So i shouldn't go near the master cylinder. I dont think any of the pipes are damaged is there anyway or testing the vacuum pump

  4. #4
    BMWHaus Contributor
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    Jul 2014
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    301

    RE: Rock hard break pedal

    Pop the pipe off the brake servo give it a couple of revs and see if you have vacuum
    [hr]
    Pop the pipe off the brake servo give it a couple of revs and see if you have vacuum. If you have vac it could be the brake servo not master cylinder

  5. #5

    RE: Rock hard break pedal

    im hopeing its not the servo because it looks like a right pain replacing that

  6. #6
    BMWHaus Contributor
    Join Date
    Jul 2014
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    301

    RE: Rock hard break pedal

    It's a nasty job. Post up your findings.

  7. #7

    RE: Rock hard break pedal

    Took pipe off to check the vacuum and its perfect.

    Going to double check all the piping for tiny holes but 99% sure at this stage its not this.

    Whats my next move anyone

  8. #8
    BMWHaus Guru
    Join Date
    Jul 2013
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    1,784

    Rock hard break pedal

    Beer bottle under your brake pedal? Only messing.
    Did this happen suddenly or gradually over time? Petrol or diesel, don't diesels have vacuum pumps?

  9. #9

    RE: Rock hard break pedal

    Got sorted lads its a 318tds engine in a 318is coupe shell.

    Brought a new hose from the vacuum pump to the servo and works a1 now. Delighted i didnt have to do to much ripping.

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