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ABS Noise - 3B Engine

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  • ABS Noise - 3B Engine

    Another ABS fault. This time when driving there is a hissing/whooshing noise coming from the ABS pump area. When braking, the car squirms and you can feel the ABS through the brake pedal. Sometimes when you come to a stop you hear a 'boing' type noise.

    Previously the ABS light came on after 25mph or thereabouts. I've cleaned all the sensors and the teeth and the abs light has gone away. Car drives fine without the strange noise and brakes normal when ABS is switched off.
    Steve

    1990 RR 20V
    1982 SWB UR - RS2 Engine


  • #2
    The 'boing' noise you're hearing is the hydrocoptic marzlevanes aligning themsleves with the lunar waneshaft to prevent side fumbling, all perfectly normal
    sigpic
    1991 Audi S2 3B - 2.5 Stroker engine
    1997 A6 2.5TDi quattro avant - C4
    1976 RD250E / 350LC cafe racer

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    • #3
      mmmm..... Need to get me some "side fumbling"....
      Honda CBR 1100XX Blackbird Turbo....undergoing major changes.....
      S2 Coupe... bit easier off the line...
      '03 ZX12-R daily hack.... lots of nice bolt ons...

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      • #4
        I've had a reply on this off another site and they have suggested that the air gap may not be correct. I thought that if it wasn't, then the sensor would not read and the ABS light would be on?
        Steve

        1990 RR 20V
        1982 SWB UR - RS2 Engine

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        • #5
          Gap was wrong on mine and the abs light came on. No strange noises or pedal feeling.
          Sounds to me like it might be the regulator or the abs pump itself.
          Nothelle S2 Avant in restoration
          Wr Ur Quattro (also in restoration)

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          • #6
            Mine used to make a strange farting noise until I deleted the bomb so it must of been that

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            • #7
              A faulty, dirty or badly adjusted sensor can definitely make the abs pump cut in as you come to a stop. Classic symptom.

              S2 Coupe 3B Project


              Ur quattro restoration

              S2 Avant

              Boost is the new rock and roll!
              sigpic

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              • #8
                Originally posted by newsh View Post
                A faulty, dirty or badly adjusted sensor can definitely make the abs pump cut in as you come to a stop. Classic symptom.
                I backed all of the sensors off today and the noise stopped. Just need to find the sweet spot now.
                Steve

                1990 RR 20V
                1982 SWB UR - RS2 Engine

                Comment


                • #9
                  So what is the sweet spot? I've made lots of adjustments and at certain speeds when braking, the ABS kicks in.
                  Steve

                  1990 RR 20V
                  1982 SWB UR - RS2 Engine

                  Comment


                  • #10
                    BTTT - a nice day for messing about with an S2. Any advice is appreciated.
                    Steve

                    1990 RR 20V
                    1982 SWB UR - RS2 Engine

                    Comment


                    • #11
                      Any update?

                      Normally you just push the sensor in until it bottons, do you have the rubber boots fitted because they can change the amount they go in.
                      sigpic
                      1991 Audi S2 3B - 2.5 Stroker engine
                      1997 A6 2.5TDi quattro avant - C4
                      1976 RD250E / 350LC cafe racer

                      Comment


                      • #12
                        Originally posted by AndyP View Post
                        Any update?

                        Normally you just push the sensor in until it bottons, do you have the rubber boots fitted because they can change the amount they go in.
                        I have new sensor caps which I will be fitting tomorrow afternoon. Fingers crossed.

                        Are the sensors still available new?
                        Steve

                        1990 RR 20V
                        1982 SWB UR - RS2 Engine

                        Comment


                        • #13
                          Not sure, but I think there might be a Land Rover sensor that works.
                          sigpic
                          1991 Audi S2 3B - 2.5 Stroker engine
                          1997 A6 2.5TDi quattro avant - C4
                          1976 RD250E / 350LC cafe racer

                          Comment


                          • #14
                            New abs caps sorted this and re-set the air gap by using the sacrificial plastic splines.

                            Fit the new caps, push the sensors in and tighten the bolt. Job done. :-)

                            Can't believe how much time I spent ******* about when all I had to do was buy new sensor caps.
                            Steve

                            1990 RR 20V
                            1982 SWB UR - RS2 Engine

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