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This sounds like symptoms of a faulty brake booste (archive)
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Posted by Jon R. Lewis on September 25, 2001 at 12:45:59:

In Reply to: 1989 325ix antilock/brake problems... posted by Mark on September 25, 2001 at 10:16:13:

The master cylinder could also be suspect but since the pedal "pushes back" the booster may have a vacuum leak or other failure.

has the fluid been changed in the last 2-3 years? have the brake calipers been rebuilt in the car's lifetime?

depending upon the car's maintenence history, or lack thereof, you could be experiencing multiple problems that amplify each other.

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