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Hydraulic Brake Booster
I went through this some months back. I saved this post and reposted below to help you. One tip, NAPA carries the o-ring but make sure you have them open the metric ring box. There is a standard (inch) O ring box with almost the same part number but that O ring won't work.
Again, the metric box, and the part number must match exactly, 72222. Make sure to put some ATF or pentosin on the O ring to keep from tearing in when you put it on.
Darius
If your brake booster is leaking, there is a much, much cheaper alternative than replacing the entire booster. The Dealers are not authorized to complete this repair procedure for some unknown reason (liability and/or profit). BimmerHaus Performance in Broomfield Colorado, has completed this repair many times. They will do it for about $100. You can contact them at (720) 566-0521 or
www.bimmerhaus.com and talk to Dave Stackhouse or Jim Leithauser. You can try replacing the leaking O-ring in the booster unit yourself, if you know what you are doing. It reguires removal of the booster unit. Where it connects to the reservoir, there is a bolt that you can remove with a vice grip thus exposing a black plastic cap about 1 and 1/12 inches in diameter. The O-ring is located in this cap. You can obtain this O-ring from a local N.A.P.A. auto parts store. It is listed by them as O-ring # 72222. BE AWARE, THAT ONCE YOU REMOVE THE BOLT, THERE IS A COMPRESSED SPRING, APPX. A FOOT LONG, THAT WILL CAUSE INJURY AND SEND PARTS FLYING.
Link:
http://www.bimmerhaus.com/