master cylinder question

I pop open my Master cylinder and the oil in front reservoir is gone. Supposedly a leak in the back..

So i follow the lines and find nothing.. no leaks. Then take off the wheel and check for leaks on the cylinders, no apparent leaks.. a little dirty but that's it.

But, whenever i fill up the master cylinder, after a while it seems to be over flowing and leaking out.


Can it be possible that the master cylinder seals are fooked and the oil from the front reservoir leaks into the back reservoir and then overflow on the ground ?

i'm lost here.. if there are no leaks, where does the oil go ? out of the cover??
Author: fr0st