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Vibration in the brake pedal

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  • Vibration in the brake pedal

    Hello,

    I have a vibration in the brake pedal even when the car is not moving. The vibration seems to come from the hydraulic circuit as it’s vibrating too.
    I have replaced the hydraulic pump but unfortunatly, the problem remains.

    Also, not knowing if it’s the consequence or a possible cause, the ABS can start to work at very low speed (max 10km/h)

    I have no defaults in the monotronic.

    any idea ?

    Thanks


  • #2
    Checked for fault codes in the ABS unit?

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    • #3
      This is a sign of either the hydraulic servo failing, or the bomb completely gone. Does it vary with engine speed?

      Either one is a big bill, and don't seem to last, so I went with a late model cabriolet vacuum servo, and a refurbed PAS pump from Error404 and not had a problem since

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      • #4
        Thanks for your answers.

        The vibration vary with the engine speed yes. The pump have just been replaced by a refurbished one without change.

        I have no fault in the ABS unit.

        Someone told me that it can be caused by a special pipe in the hydraulic system... But I don't know more

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        • #5
          I think, I'm having the same problem so will be observing this topic .Already changed servo for refurb one swapped pas pump and brake bomb and still the same. Dont want to go vacuum route

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          • #6
            Seriously? Nobody?

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            • #7
              The brake bomb is a possible culprit. Have you tested how many pumps you get before the brake pedal goes solid with the engine off?
              Greg

              S2Forum.com Administrator & Webmaster

              '93 Coupe with a few tweeks

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              • #8
                If you've changed all three you either have a faulty new component or a ghost in the system -theres nothing else to it to be honest.

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                • #9
                  Have the same problem, it was the brake booster, behind master cylinder

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                  • #10
                    Yup, I think that was where my problem was before going vacuum.

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