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Date: Sun, 10 Sep 2000 11:59:21 +0200
From: Robert Brown <rjbnopsamnetnospam.se>
Subject: Re: This is my master cylinder, right?


Hi, comments below: Josh Vickery wrote: > I have an '86 Saab 900 with god knows how many miles (lots, > odometer busted at 98k, I think that was 6 years ago) but it > has been running well enough. Right now, it has developed a > new problem. The clutch had been odd since I got it, and > after poking around on-line for a while I found that the > play was due to metal fatigue in the pedal and master > cylinder fork, and could be corrected by drilling both parts > out and using a larger cleavis pin. This worked like a > charm, and I had wonderful clutch action for about 500 > miles. Then it all went to hell, all at once. I can > successfully engage the clutch, but as soon as I let up > pressure on the pedal there is a hissing noise(a quiet > noise, only really noticible when operating the pedal by > hand with my ear next to it), and the pedal sinks to the > floor. Needless to say the car lurches into gear, making it > very difficult to drive, and certainly not very good on the > transmission. There are at least three things that could be going on here, possibly in combination: 1. You may have air in your hydraulics. Bleed the system using air pressure bleeder attached to brake fluid resevoir. 2. The seals on the master cylinder piston could have worn out or disintegrated, allowing fluid to pass by. A set of replacement seals shouldn't cost more than USD 20. 3. (further to what Walt Kienzle says in a posting on this thread) If you haven't changed your clutch and brake fluid for quite a while, the water absorbed during that time can start to corrode the inside of the master cylinder, which will pit it and reduce the effectiveness of the master cylinder, even if the seals are relatively intact. This could account for the fluid you hear rushing past at certain points of the pedal travel. Some have been able to smoothen out such pits by using a fine emery cloth wrapped around a wood dowel, but that's time consuming. Your best bet is to, if you haven't done so already, take the master cylinder apart and look for corrosion or score marks. If the inside looks OK - or is fixable - buy a new set of seals. > > > My theory is that this is due to failure of the master > cylinder(the new strain of having to actually perform it's > intended purpose was just too much), so I have ordered a new > one from www.thesaabsite.com along with a new pedal. That Mastertech guy really seems to be raking in the money with all that advertising he does on this newsgroup, eh? -----8<-----8<----cutting ... Regards, Robert Gothenburg 1983 900GL, 1999 9-3 200

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