Originally posted by KULTULZ
You may have a bad booster. There is a seal between the master cylinder and booster that is supposed to not allow fluid suction if there is a leak in the booster. It may be that the booster has a small leak but is not sucking the fluid out of the master cylinder.
Sounds like you have a bad booster (ruptured diaphragm).
If the master cylinder leaks it will fill the booster up to the rod then leak out around it. otherwise there is no liquid transfer between the master cylinder and the booster. You can get a new diaphragm and install it your self.
If you don't make mistakes. your not doing anything.
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