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Date: Fri, 5 Dec 2003 16:35:49 +0000 (UTC)
From: "Tom" <saabtechnopsamnnect.com>
Subject: Re: 9000 clutch master cylinder


"Grunff" <grunffnopsam.com> wrote in message news:1070636737.846.0nopsammia.uk.clara.net... > Simon Putz wrote: > > > > some days ago my clutch master cylinder fucked up (lucas model 90-) so i had > > to ride the train to work and after 2 days i got the repair kit for hm. something like 8 euros :) > > i then removed the old cylinder from the car, funny nuts those trolls must have ..., and dismantled it. > > the girling ring flied through all the room, but okay i had a new one, so i didnt care much, > > then i took this whole piston out, wriggled this funky triangle-safety-ring thing down, and took off the > > first rubber and the o-ring. took off the second rubber too, of course i didnt remember the way they were on. > > so i wriggled on the one at the end of the piston, and it was there in the wrong way, damn, removed it, flipped > > and put it on again, i already kinda mangled it while doing that. then i put on the new o-ring and the other rubber > > which suddenly had a piece missing, damn, and i couldnt get this strange security ring thing on again, it was widened > > out or something, who cares, so i threw the whole cylinder to the sawed-in-parts motor mounts and ordered > > a new cylinder for 100 Euros. now i finally got it :) and to my surprise i noticed that there seems to be a spring inside, > > or it builds up so much pressure that it goes back on its own! well either my old cylinder was REALLY wasted or this one > > is a newer design or something. the old had the part # 7594039 (really HARD to read) and the new one has 4384079 stamped in > > they look the same, and im now going to install the new cylinder, priming it with brake fluid, hoping that eases up bleeding a bit. > > what do you think guys? > > It should have a spring - at least the earlier ones did (as do > practically all clutch masters). > > Good luck bleeding - I hate doing 9k clutch bleeding - they're > worse than a C900, even with a pressure bleeder. > > BTW, if you haven't replaced your slave, there's a good chance > it will fail soon :-( They seem to always fail shortly after you > replace the master (maybe it's having new brake fluid in there, > I don't know). > > -- > Grunff There is a known issue that brake fluid attacks and degrades the feed pipe from the fluid reservoir to the master cylinder and the rubber part of the hose from the master cylinder to the slave cylinder creating tiny marbles of rubber. After master cylinder replacement, because of pressure bleeding, these marbles of rubber find their way into the slave cylinder and often cause the slave to fail soon after, [sometimes the new master too]. It is this rubber that is the main cause of the fluid being black in colour. I have found that fitting a new feed hose to the master cylinder when fitting a new cylinder and pressure bleeding with at least 20psi and having someone slowly pushing the clutch pedal up and down at the same time gets all the crap out of the system. After bleeding using copious amounts of fluid, leave to stand for 10 minuets before trying the clutch. Using this method has reduced slave cylinder failure dramatically. HTH, Tom, Saabtech.

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