my bmw 2002 330i has a hissing sound when pressing the brakes and when it's idle on 2002 BMW 330i

what needs to be fixed and what"s the cost?

by in Jacksonville, FL on September 21, 2012
2 answers 2 comments
ANSWER by on September 21, 2012
sounds like you have a vacuum leak or a brake booster is your pedal hard when you brake?
COMMENT by on October 13, 2012
thank you
ANSWER by on September 21, 2012
Brake booster Dont know the cost
COMMENT by on October 13, 2012
thank you