Servo Probs!!!!!

[Rob-16v]

Does anybody know how much a brake servo wud cost me(second hand).wen i press my brake pedal,in the passanger foot well theres a hissing, is this the servo???

[Aragorn]

hissing is normal?

[PROF]

First of all has your brake pedal hard this is one problem and do's the engine missfire when you keep your foot on pedal if so then the servo is
no good and needs replacing.
Hope this is some help
Richard

[Rob-16v]

thanks.