smg1986 Posted March 30, 2011 Share Posted March 30, 2011 I realize there is 1000 threads on this, but thought i'd add one more. I've had a hiss at my feet since i bought this thing. Yesterday replaced check valve, and still the hiss. I can't imagine my booster is bad because brake pedal reacts normally...meaning not soft, not hard to press, just normal. I have a vacuum leak, that's a given, but where is it? the hissing disappears when the either the brake or gas pedal is depressed. The only thing it really affects that i know of is my idle. i'm right at 1200rpm now, but if i push the brake in and stop the hiss i drop down to about 800-900rpm. much appreciated in advance for help Link to comment Share on other sites More sharing options...
ratrapp Posted March 30, 2011 Share Posted March 30, 2011 block the vacuum off to the booster and see if it goes away.if so then you've got a bad booster. Link to comment Share on other sites More sharing options...
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