Quote:
Originally Posted by john the great
hey i have the exact same problem. only during cold weather. the hissing starts when i press the pedal. does not seem to effect brake performance. I am thinking that the problem is in the vacuum booster. and i plan on replacing it. have you found the exact problem? BTW i replaced hte check valve. did not change the problem.
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I found the problem.
there was a leak in the brake booster. i bought one at the junk yard and replaced in about 1/2 a day. it would have gone a lot faster if i would have known what i was doing from the begining.
Note also that my original problem was that the brakes did not work at all when the temperature was freezing. this was caused by water that was in the brake booster. the water came in from the leak when moist air came in a condensed.
wow.