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Originally Posted by boneheaddoctor
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.
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So last nite @ 10:30pm with a outside temp of -2F, I was in my non-heated garage separating the above mentioned items.
I could only pull the master cylinder away from the booster about a 1/2"
for fear of kinking a brake line.
No fluid any where, and I didn't see any gasket either.
I remounted, started the car and pumped the brakes, this time I did notice that there is a slight fade fell in the pedal.
This a good sign of a bad master cylinder?