help hissing brakes

[andrea]

only just purchased a mazda 2002 demio auto 2nd hand (imported from japan) and am experiencing hissing (like air being released from a football) sounds from brakes when it is released.  Happens when car warms up maybe after 20mins driving.  Any ideas...feel cheated as only just paid for it and sounds like an expensive job help with ideas please

[tomjimtom]

Happens on mine with the engine off, just air going into the servo unit.
Although I can't hear it whilst driving, so yes, would be worth getting it looked at.
You don't want the servo breaking whilst driving, not for any money
Hope that helps

Tom