Why I don't like 'em - Saab 9-5 Bulletin Board - Saabnet.com
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Why I don't like 'em
Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Mon, 10 May 2010 10:49:07
In Reply to: Speed bleeders?, FrancoisM
[Profile/Gallery]
, Mon, 10 May 2010 09:02:05
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I prefer vacuum bleeding the brakes. Pressure bleeding (and these are a pressure bleed b/c you are forcing fluid down, presumably by pumping the brake pedal) can force brake fluid into the bleeder threads. After you close the bleeder, if the threads are wet with brake fluid, the fluid will draw in moisture which can result in a bleeder that's frozen to the caliper next time you go to bleed brakes. When vacuum bleeding, you typically wind up drawing air through the threads, leaving them drier. I go one step further and pack silicone grease around the bleed nipple to seal it from air (I use a "MityVac" for vacuum) and further, anything drawn in is moisture excluding, inhert silicone grease. That said, the speed bleeder looks like it's coated with a sealant, which would prevent the corrosion problem.
If you do use a speed bleeder, don't push the brake pedal all the way down to the floor. Often there's a rough spot that develops on the brake master cylinder just past where the brake piston always stops, and when you repeatedly push past it, the master cylinder seals are damaged.
posted by 174.101.156...
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