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D2 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc. |
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#1
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D2 S8. Brake master cylinder.
Morning chaps.
Are the brake master cylinders rebuildable with new seals or is it a case of replacing the old one with an new one? Thanks Steve |
#2
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I can't see anything much in Etka that looks like a rebuild kit - they're about £230
Etka page attached
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#3
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Thanks Adrian. If they are anything like the master cylinder on my 90 the they are not rebuildable. Ho Hum.
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#4
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Is it physically leaking or a symptom you're experiencing? Not sure it's a common failure point on these.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#5
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The problem I'm getting is long pedal travel with generally poor braking performance. The overall performance has deteriorated over a period of time and with EBC discs and Yellowstuff pads the braking is normally very strong . I've changed the fluid repeatedly, bled the system again and again, changed the discs, pads. I'm now looking at the master cylinder as I'm running out of options. I also have a servo issue, which has just come to light, but I think this is just the servo hose leaking or split.
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#6
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I was going to suggest brake booster as a possible cause - more likely than the master cylinder if it's not physically leaking fluid. You would expect dodgy seals in the master cylinder to lead to loss of fluid somewhere in the system?
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#7
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Before you shell out on a new master cylinder, check for flex first. Ask someone to look under the bonnet how much the master clylinder flexes when you press the brake pedal hard. In the States they found on some cars it gets looser and moves too much, so they invented a 'brake block' which wedges between the cross bar and the end of the master cylinder to stop the firewall flexing.
http://forums.quattroworld.com/a8/msgs/5802.phtml https://forums.quattroworld.com/a8/msgs/10684.phtml |
#8
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Quote:
Zip
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2002 D2 S8: Ebony Black over Platinum. A8L Comfort front seats in black (), heated rear seats, extended Leather Pack 3, blinds, glass sunroof, MFSW, Dension Gateway 100 for iPod, ski-hatch, xenon plus, auto dimming mirrors, 20" FE wheels, billet aluminium 'brake block', gunmetal Brembo calipers 2005 B6 S4 Cabriolet: Ebony Black Pearl over Silver. RNS-E, Bose, heated seats, cruise control, retrofit aux-in, centre armrest, Milltek resonated exhaust |
#9
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Sorted!. It turned out to be valve in the servo hose just after it comes out of the inlet manifold. I changed this and everything is fine. Pedal travel normal and brakes as sharp as they should be.
I checked for flexing a couple of months ago and things were OK in this department but getting one of those blocks could be a good investment. Thanks guys. Steve |
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