Audi Coupe Quattro 2.3 20V - Czech Republic

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  • Tom_
    S2Forum Extremist
    • Oct 2007
    • 1301
    • Country: Czech Republic

    #616
    yesterday i bled the brakes third time and I went for a short ride to see if the brakes are now rock solid. Its better then before, but its still not good... there is a quite pedal travel and after i push brake pedal few times, the travel is shorter after this. Seems there is still some air there
    Audi Coupe Quattro 2.3 20V

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    • Tractor Dave
      S2Forum Zealot
      • Dec 2017
      • 5983
      • Country: Wales

      #617
      If you haven't already done so, try a pressure bleeder and also pump the brake pedal bleeding the old way with two people.
      Nothelle S2 Avant
      Black Ur project
      Silver Rs2 Project gone
      Ocianic Ur project gone
      S2 Coupe project gone
      Urs6 plus project gone

      Comment

      • Tom_
        S2Forum Extremist
        • Oct 2007
        • 1301
        • Country: Czech Republic

        #618
        Yes, I have a pressure bleeder on the top of the brake fluid container, so there was about 1 bar positive pressure in the whole brake system. I also triggered the ABS selenoids and ABS pump during bleeding ..but now i will try to pump it with two people.
        Audi Coupe Quattro 2.3 20V

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        • Tractor Dave
          S2Forum Zealot
          • Dec 2017
          • 5983
          • Country: Wales

          #619
          Be careful if your fluid bottle is old. I've had one burst. I normally don't go higher than 15psi.
          Nothelle S2 Avant
          Black Ur project
          Silver Rs2 Project gone
          Ocianic Ur project gone
          S2 Coupe project gone
          Urs6 plus project gone

          Comment

          • Tom_
            S2Forum Extremist
            • Oct 2007
            • 1301
            • Country: Czech Republic

            #620
            Its old, but not old like old hydraulic brake system container...I think its about 10 years or so...As i have dual stage vacuum booster
            Audi Coupe Quattro 2.3 20V

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            • Tom_
              S2Forum Extremist
              • Oct 2007
              • 1301
              • Country: Czech Republic

              #621
              The bumper is painted. Yesterday I bought indicators, so I have to mount them fully. Also bought some honeycomb mesh to fill that bumper with that. Thinking of painting the IC to black to keep it more "stealthy".
              Brakes feel good, or I get used to it So not sure but will see on the MOT how the brakes brake, but I think it's good.
              Have to made some bumper mounts, front one are almost done, but those on the sides I have to figure it out.
              Attached Files
              Audi Coupe Quattro 2.3 20V

              Comment

              • Tom_
                S2Forum Extremist
                • Oct 2007
                • 1301
                • Country: Czech Republic

                #622
                Mesh added into the bumper, also the indicators are mounted...Still struggling to fit the side mounts in the wheel arches. But at least its looks much better now.
                IC is painted to have more stealth look
                Attached Files
                Audi Coupe Quattro 2.3 20V

                Comment

                • Tom_
                  S2Forum Extremist
                  • Oct 2007
                  • 1301
                  • Country: Czech Republic

                  #623
                  Finally bumper is fitted...Hopefully it will stays there after MOT and some driving Next on the to-do list is an install dashboard. Hope i will find all the screws for the dashboard
                  Attached Files
                  Audi Coupe Quattro 2.3 20V

                  Comment

                  • Tom_
                    S2Forum Extremist
                    • Oct 2007
                    • 1301
                    • Country: Czech Republic

                    #624
                    Nothing happened for a long time, because I was working on the Porsche. But I want to go to the MOT in two or three weeks. The biggest problem and the biggest problem is that due to the thicker water cooler and the location of the electric servo, there is no shrouding around the radiator and when the car is stationary, it overheats quite a bit. It is around 100 degrees, which seems quite a lot to me. I honestly don't want to redo the servo and change the radiator to a thin sheet metal one. I will try to at least do some air guidance from the front of the car before the car goes to the MOT and I will turn on the fan with a button on the tablet so that I don't have to wait for the temperature to get high.
                    I thought about using some coolant booster, but I don't know to what extent it works and whether it's just a waste of money.
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                    Audi Coupe Quattro 2.3 20V

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                    • PeterS
                      S2Forum Addict
                      • Jul 2003
                      • 423
                      • Country: United States

                      #625
                      beautiful work Tom...re:ducting - you need to think about sealing the path from the grille to the front of the radiator as much as possible so the only place the air has to go is through your radiator and not around it. Same for the fan side -you want to shroud the fan. The main problem with the side mount radiator is that there is no where for the air to go (exit) after the radiator, so you are fighting against a lack of an obvious air flow path. Credit for this ducting goes to my Mechanic working on my nephew's AAN-converted Coupe Quattro.
                      IMG_5438.jpeg IMG_5441.jpeg IMG_5437.jpeg
                      Peter S

                      1990 ErsatzS2 - track toy
                      1991 Coupe Quattro
                      1991 Coupe Quattro
                      1995 S6 Sedan
                      1995 S6 Wagon

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                      • Tom_
                        S2Forum Extremist
                        • Oct 2007
                        • 1301
                        • Country: Czech Republic

                        #626
                        Thank you,
                        Yes, you are right, i have to make something similar like your nephews car. It looks nice.. What material is that? Its secured via screws? Some flanges on the radiator? welded or glued? Thanks
                        Audi Coupe Quattro 2.3 20V

                        Comment

                        • Tom_
                          S2Forum Extremist
                          • Oct 2007
                          • 1301
                          • Country: Czech Republic

                          #627
                          Finally found a culprit of not working ABS. It was a bad combi relay and a diff switch PCB. Could someone take a pictures of how not butchered PCB should looks like? Thank you
                          Attached Files
                          Audi Coupe Quattro 2.3 20V

                          Comment

                          • K Simmonds
                            S2Forum Zealot
                            • Dec 2007
                            • 7627
                            • Country: Wales

                            #628
                            I'm pretty sure I've a couple of spare 3B diff lock switches if you need one and I think another one may already be in bits, will try and take a look at some point today for you. A knackered difflock switch will normally cause the ABS light to stay on so you've almost certainly found your problem.
                            1990 B3 2.0 80 quattro.
                            1992 C4 2.8 Avant quattro
                            1994 MTM RS2.
                            1998 B5 TDI quattro Sport.
                            2000 B5 TQS.

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                            • Tom_
                              S2Forum Extremist
                              • Oct 2007
                              • 1301
                              • Country: Czech Republic

                              #629
                              K Simmonds There were two types of diff switches. The early one (longer push button) and late one (smaller button). I have early one, so if you have the early one laying somewhere around, please take some detailed pics of that PCB and routes. It will help me a lot to replicate a new PCB or at least know how it was back then. Many thanks
                              Last edited by Tom_; 7 April 2026, 07:16.
                              Audi Coupe Quattro 2.3 20V

                              Comment

                              • PeterS
                                S2Forum Addict
                                • Jul 2003
                                • 423
                                • Country: United States

                                #630
                                Originally posted by Tom_
                                Thank you,
                                Yes, you are right, i have to make something similar like your nephews car. It looks nice.. What material is that? Its secured via screws? Some flanges on the radiator? welded or glued? Thanks
                                https://www.michaels.com/product/pla...ology-10567988 - corrugated plastic project board (probably ABS) from a craft store
                                Peter S

                                1990 ErsatzS2 - track toy
                                1991 Coupe Quattro
                                1991 Coupe Quattro
                                1995 S6 Sedan
                                1995 S6 Wagon

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