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Old 03-19-2013, 05:17 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,054
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.
Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
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