Hey guys, I just put a new MC and Booster on my '91 318 and the booster is hissing like crazy. Very loud vacuum leak from inside the engine compartment. If I disconnect the vacuum hose from the booster and put my thumb over it the sound goes away so that seems to point to a booster issue. I also noticed that when I press down on the brakes the noise goes away which seems odd to me.
When I swapped everything over I made sure to install the new o-ring between the MC and Booster but other than that I can't really see anywhere else the thing could be leaking from except perhaps internally. Did I just get a bad one?
When I swapped everything over I made sure to install the new o-ring between the MC and Booster but other than that I can't really see anywhere else the thing could be leaking from except perhaps internally. Did I just get a bad one?
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