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Old 03-19-2013, 06:17 AM
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bluebee bluebee is offline
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Location: San Jose, California
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by poolman View Post
the pedal seems like it goes unexpectedly down about a 1/4 inch and the car brakes hard when this happens
I don't know what would cause this, e.g., a leak of brake fluid would show up eventually, and you would think a loss of vacuum at the booster would too.

Testing the BPS seems simple enough with "flying leads" and a DMM; but, if it's intermittent, it might not show all the time.

I would hope cn90, JimLev, RDL, or any of the others more knowledgeable than I can provide guidance.
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