Booster vacuum leaks - Saab 900 Bulletin Board - Saabnet.com
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Booster vacuum leaks
Posted by S Carlson [Email] (more from S Carlson) on Wed, 7 Feb 2018 10:23:49
In Reply to: Re: 1986 8 valve - idle rpm reduced when brake pedal is depressed, 79gle, Sun, 4 Feb 2018 20:41:03
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Even if your car isn't sucking in brake fluid, there's still a chance there is a vac leak through the booster. There's a vent hole under the master, where the master connects to the booster. The car will suck in air through here. You can feel for it with your finger while the car's running.
If your car is sucking in air through this hole, then you need a new front seal on your brake booster. You can take off the master and bend the lines to the side to expose it and easily change the seal.
On my '86, it was sucking in air there like there was no tomorrow - a massive vac leak, which caused all sorts of warmup issues. Changing a small seal in there (Girling part # 64491061) will fix the problem. See the thread I linked to, for more information.
posted by 140.247.10...
Saabnet thread on booster seal
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