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Originally Posted by whunter
Remove the fasteners holding the master to booster, gently seperate enough to check for leak.
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like he says..I had that happen to my W116 after I bought it...slowly disappearing brake fluid..everything remained dry......when my mastercylinder started the sinking pedal thing I found out where it was going...it was leaking into the booster....it was half full (right up to the center hole) of brake fluid...
when you seperate those two you need a new O-ring to seal it or you will have a massive vacuum leak.