danofarming said: (quoted from post at 09:55:55 11/01/09) Check your vaccum line from the engine to the booster. My uncle had the same problem with his Chevy some years back, spenta a lot of money trying to find the problem. The hose had collapsed on the inside.
After rereading about the problem you are having, a collapsed hose will act just like you describe. It can allow a little air to pass so that a vacuum can be built up in the booster. That accounts for the brakes being Okay on the first pedal stroke. When you try to pump the pedal, the vacuum is too slow to recover so you get little or no assist.
Check the hose first before replacing the booster again. If you replace it make sure it is with a hose designed for vacuum use. Other types of hose can separate internally or collapse in use.
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