"Bench Bleeding" - Saab 900 Bulletin Board - Saabnet.com
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"Bench Bleeding"
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Posted by Stephen Goldberger (more from Stephen Goldberger) on Tue, 22 Jul 2003 16:27:38 Share Post by Email
In Reply to: Re: Anyone who has done their own mast. cyl. please share.., JohnB, Tue, 22 Jul 2003 09:25:06
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What John B did is a form of "bench bleed". Without access to some kind of fixture, you aren't going to be able to "work" the m/c off the car, but working the m/c with the brake pedal after the m/c is in place but before the lines are hooked up accomplishes the same thing.

I had withing a couple of weeks prior flushed the brake fluid, and really didn't want to hoist the car and suck out the lines again. I "pre-bled" the m/c much as John B did (except I used Ms. Jessica to push the pedal - it's her car, after all), then left the lines in place but not sealed up for a few minutes (translation - I bumbled and fumbled and pushed and turned and finally got the fittings screwed together, all the while fluid dripping down.) and when all was sealed up, the pedal was rock hard.

Prior to beginning (we always put step 1 at the end, don't we?) I layed in a sheet of plastic-coated paper freezer wrap over the inner bodywork and stuffed rags in on top of that. Most of the brake fluid was soaked in the rag, and the paper kept it off the sheet paint. Then when all was done I sprayed it down with a hose. Brake fluid is an excellent paint remover ;-).

One final point. These cylinders are eminently rebuildable so long as the inner bore is free of pitting. But it isn't easy. I've rebuilt one in the presence of a Saab Master Tech, and I could just barely accomplish the task with him doing the hard parts (taking the M/C apart and then putting it back together :-))

posted by 24.166.84...

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