URS4 rear caliper bleed. Easy?

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  • Algernon
    S2Forum Fanatic
    • Jan 2010
    • 79
    • Country: United Kingdom

    #1

    URS4 rear caliper bleed. Easy?

    I know from experience that some cars are a pain in the backside when trying to bleed them. I'm going to replace my n/s/r caliper. I know how to but are there any special moves (engine running/off etc?) Can I just use the down-open-shut-up etc etc method with my missus following instructions at either end?
  • UrS4boy
    S2Forum Obsessed
    • Feb 2006
    • 11859
    • Country: Canada

    #2
    When I replaced my UrS4 calipers, I left them gravity bleed (bleed screw open with a transparent hose to a jar) for some time. Then I used my MitiVac to suck some more fluid through, then more gravity bleeding. The problem with getting someone to "help" you, they can press the pedal too far and push the Master Cylinder (MC) piston (and sealing cup) past the previous wear point in the piston bore. This can damage the seal, leading to MC internal leakage, i.e. you have to pump the pedal to get the brakes to work.

    Here is a post on rear brake R&R on a C4 UrS car (note the hot links inside to two caliper rebuilt procedures if you are feeling lucky and/or brave):

    The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
    RS2'd 93 UrS4 5 spd sedan
    94 UrS4 V8 6 spd manual avant

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    • goodall
      S2Forum Maniac
      • Jul 2008
      • 810
      • Country: Northern Ireland

      #3
      Did this last week, I bleed the caliper regular way of press pedal and open the valve. Did with the handbrake cable off as I remember something on quattro forum about not being able bleed a new caliper properaly with handbrake cable attached

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      • Algernon
        S2Forum Fanatic
        • Jan 2010
        • 79
        • Country: United Kingdom

        #4
        Excellent. Thanks Guys.
        Anybody know the part numbers of he handbrake cables?
        The diagramme in the link shows #10 but there's no part number.
        93 6 speed manual URS4

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        • UrS4boy
          S2Forum Obsessed
          • Feb 2006
          • 11859
          • Country: Canada

          #5
          Originally posted by Algernon
          Excellent. Thanks Guys. Anybody know the part numbers of he handbrake cables? The diagramme in the link shows #10 but there's no part number.
          93 6 speed manual URS4
          You need to follow ALL your posts. I gave you the link to the eBrake info in answer to your other brake post:



          RS2'd 93 UrS4 5 spd sedan
          94 UrS4 V8 6 spd manual avant

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          • GazzaG60
            S2Forum Freak
            • Mar 2007
            • 4133
            • Country: United Kingdom

            #6
            i use a motive products bleeder.

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            • Algernon
              S2Forum Fanatic
              • Jan 2010
              • 79
              • Country: United Kingdom

              #7
              Originally posted by UrS4boy
              You need to follow ALL your posts. I gave you the link to the eBrake info in answer to your other brake post:
              Jeez, you Canadians ey?
              Host the Winter Olympics, do fairly well and there's no stopping you. I'll have you know that we won a medal in the Downhill Teatray and if there'd been a Shreddie Knitting event we'd have taken the gold in that also.

              Seriously and genuinely, thanks for the typically "high horse elitist" answer Dave and the link to the qworld page. You fail to take into account that maybe I'd not been on here or had the luxury of time to review all my questions since you posted the answer.

              I usually search AW and the amazing faq page on AW but a lot of times when I follow links on the faq page it tells me something along the lines of "page or topic not found??" Can't remember exactly what, so I tend to ask in here. A British forum which makes it better anyhow.

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