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Brake Booster Sympton 200 1990

posted by  joe pulkowski on  Sun Nov 16 03:47 CST 2008
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last visit: Sun Oct 27 07:53 CST 2013
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I can hear what sounds like an air leak when I initially press the brake pedal. The pedal holds pressure fine when the car is off, one pump brings the system to pressure. When I start the car, the pedal can go lower than I think its supposed to, and remember it. I've got no problem with braking power. Is this a symptom of a Booster leaking? I first noticed it when I changed the front pads recently. I used channel locks to spread the pistons to fit the new pads, like I've done for years. When I reassembled, I noticed the air venting sound inside the car.

The check valve fitting visually looks ok. But I'm thinking the sound I hear inside probably means a diaphragm leak? After 19 years not bad I guess.

I looked on FCP and there boosters are 295, and NAPA has an OE Bendix for $129. Anyone ever buy one from NAPA??

Replacement looks very straight forward. A mornings job for a first attempt. Does the master have enough play once its unbolted from the booster to move it enough to clear for the booster removal?








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    Brake Booster Sympton 200 1990

    posted by  Stickbuilder on  Sun Nov 16 03:59 CST 2008
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    With the engine idling and the car in park, press the brake pedal and hold it down. Does the idle speed change, or does the engine start ilding roughly? If so, then you probably have a ruptured booster diaphragm. If the idle does not change appreciably, then you probably do not have a booster problem. The low pedal might be due to air in the brake lines, or a bad master cylinder. Have you checked your brake fluid level? How long since the brake fluid was purged and changed?








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      Brake Booster Sympton - Check for vacuum retention -safety 200 1990

      posted by  sutherml on  Mon Nov 17 11:54 CST 2008
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      last visit: Sat Jun 29 19:15 CST 2013
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      Also check that your booster can retain a vacuum at least for a short while to permit emergency braking if your engine stalls, giving no manifold vacuum.

      There are two tests.
      Firstly, with the engine idling in neutral apply the brake and hold it down. Then switch off the engine. If the pedal starts to rise against your foot then the booster is not holding vacuum.
      How bad is it?
      Check with this test. On a back road driving at the speed limit just turn your engine off. Wait 1 second and apply the brake. There should be no reduction in braking. According to a booster manufacturer, retained vacuum should be enough for three applications of the brake. I'd drop that to one and a half applications of the brake, as the first (and only) emergency stop should not exhaust all the vacuum.







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