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Old 10-02-2012, 04:18 PM
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dc_wright dc_wright is offline
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Mein Auto: '06 Z4 3.0si, '11 128CiC
Anyone Had Power Brake Booster With a Vacuum Leak?

I think I may have a vacuum leak in my brake booster. I have a turbo like whistle I can hear better from inside the car than from the engine compartment, I have power boost to the brakes but the effort feels higher than it should (definitely higher than my E46 by comparison), and when I hook my vacuum gauge directly to the manifold I get 19", but when I tee in with the brake booster connected in I get 17"-18". Also when I apply the brakes with the vacuum gauge teed in I get a vacuum drop (expected) but it takes several seconds to build back up to 17".
Anybody had this before?
I've sprayed brake cleaner all around the intake manifold and the associated hose connections without any vacuum leak associated signs, but the "turbo whistle" persists.
2006 Z4 3.0si Sport Package (But I'll still hang with my "homies" in the E36 forum)

Last edited by dc_wright; 10-02-2012 at 04:20 PM.
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