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Early type brake pressure regulator

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  • Early type brake pressure regulator

    I'm after the early type brake pressure regulator fitted to pre 92 quattro cars. It sits in front of the ABS unit. I'll dig out a pic and part no tonight.
    Cheers'en, AndyC
    1994 ABY Coupe - Projekt Alpinweiss

  • #2
    im after one as well let me know how you get on

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    • #3
      It sits in front of the master cylinder on early cars.

      What is the difference between the two different parts Andy?

      For reference:
      early 893612303A
      late 8A0612303
      Panthero Coupé quattro 20vt
      Indigo ABY coupé
      Imola B6 S4 Avant

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      • #4
        I have both of them.

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        • #5
          From S2central, all in Bar:-

          Front___Rear up to 92___Rear after 92
          _50______30 - 35_______37.5 - 41.5
          100______45 - 50_______51.5 - 57.5

          So, early type reduces brake pressure to the rear by quite a bit.

          Ideally, I'll fit an adjustable one but wanted to try off the shelf first, as it'll be a lot neater and there's a question mark about the adjustable regs with ABS. I'll be plumbing it in before the pump, as per the OE one, so that's perhaps not an issue.
          Cheers'en, AndyC
          1994 ABY Coupe - Projekt Alpinweiss

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          • #6
            Surely the later type will be better for you with your rear brake upgrade? Or are you starting to lock up?

            I want more rear bias! Its a same I just refitted mine & bled the brakes
            Panthero Coupé quattro 20vt
            Indigo ABY coupé
            Imola B6 S4 Avant

            Comment


            • #7
              An extra 30mm dist radius takes care of that. With the ABS off, the rears lock up like a hydraulic handbrake on a rally car! not ideal. Bigger rear brakes mean more heat capacity, so more consistent braking. There's only so much grip available, so with the ABS off, I want the fronts to lock first (for obvious reasons).
              Cheers'en, AndyC
              1994 ABY Coupe - Projekt Alpinweiss

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              • #8
                I wonder if you can adjust it using that threaded nut on it?
                Panthero Coupé quattro 20vt
                Indigo ABY coupé
                Imola B6 S4 Avant

                Comment


                • #9
                  Oh yes, where's that? Pic? It may be underneath on mine, as I can't see a part number on the top or front.
                  Cheers'en, AndyC
                  1994 ABY Coupe - Projekt Alpinweiss

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                  • #10
                    There is a big hex headed plug on one end, I assume that is used to set pre-load on a valve spring or something inside. I didn't want to start messing with it though.
                    Panthero Coupé quattro 20vt
                    Indigo ABY coupé
                    Imola B6 S4 Avant

                    Comment


                    • #11
                      Need to get hold of one and see what it's made of...
                      Cheers'en, AndyC
                      1994 ABY Coupe - Projekt Alpinweiss

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                      • #12
                        Originally posted by Rusty View Post
                        An extra 30mm dist radius takes care of that. With the ABS off, the rears lock up like a hydraulic handbrake on a rally car! not ideal. Bigger rear brakes mean more heat capacity, so more consistent braking. There's only so much grip available, so with the ABS off, I want the fronts to lock first (for obvious reasons).
                        Sounds....interesting!!! Be a proper ditchfinder in an emergency stop lol
                        sigpic

                        1992 3b S2 Coupe

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                        • #13
                          With the ABS on, it's absolutely not a problem. I'm looking in to taking the ABS off for track.
                          Cheers'en, AndyC
                          1994 ABY Coupe - Projekt Alpinweiss

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                          • #14
                            Anyone got one of the early type?
                            Cheers'en, AndyC
                            1994 ABY Coupe - Projekt Alpinweiss

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                            • #15
                              Bump, still after one of these - 893612303A
                              Cheers'en, AndyC
                              1994 ABY Coupe - Projekt Alpinweiss

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