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Old 05-27-2010, 04:13 PM
metal_clutch
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It's either a vacuum leak or your booster is leaking. Booster runs off vacuum. Booster run brake systems usually require replacing the booster and master cylinder at the same time. What typically happens is the master cylinder starts leaking and consequently leaks brake fluid into the booster. This destroys the seals within the booster and you loose pressure. In a slight leak, the booster pressure can be built up when the engine is off, because it's not pulling vacuum. Once you crank it up, your pedal hits the floor.

Either that or you still have air in the brake system. Do you have to purge an ABS system on these vehicles when bleeding the brakes?
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