Mine has been making a hiss everytime I depress the pedal. Only audible from inside the car. Chalked it up as a booster bladder. Replaced it with what was supposed to be a good used unit, and now it only does it 50% of the time.
I still have my old one and was curious if anyone has tried a rebuild. There are some videos out there for other makes and models, and it seems possible, but I am more concerned with parts/bladder accessibility. I cannot find anything for the A8, and maybe it shares the booster with another make/model. Or are they repairable?
Any input is appreciated.
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