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that is possible for the fluid to leak into the booster. do you see or can you feel and fluis at the bottom of it?
there is a seal at the back of the master cylinder that the push rod goes through. and if the seal breaks then it will get to the booster. but if the rear reservoir is empty and you see no fluid near the rear wheels then it is most likely draining into the booster.
not a problem if you have moment to leave a rating it would be appreciated.