Fitting A New Break Servo

[TommiePuglet]

Wrong way, pissing in I think, vaccum one side of the sprung loaded diaphragm, atmospheric ( the "boost" or "servo pressure" ) the other ?

Thinking about it, this may be the high pitched whistle i can hear from time to time. I think the last time i heard it i did press the brake pedal, but the whistle was still heard ?

Brakes on ours always seem powerful.

If the diaphragm is a bit leaky, brakes would be less powerful and the noise would be heard continually when the engine is running ??

I was gonna say since the hissing has started i have lost alot of my break effective and its hit or miss if the pedal isnt gonna be a rock hence why i thought the servo was the issue.