E46Fanatics - View Single Post - Hissing from near brake booster>>>WTF?
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Old 08-13-2008, 11:19 AM   #5
Registered User
Join Date: Apr 2008
Location: Birmingham, AL.
Posts: 10
My Ride: '01 330i, '04 X3.
I'm having this same exact problem. I'm thinking brake booster and/or vacuum hose. I'm interested to see what it is and how you fix it...
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