Ya you can pinch off the rubber lines to see where the problem is.   I am starting to think your master took a dump on ya bud.  With all the bleeding you have done it should have worked.  You might have ripped the plungers rubber seal.  Very rare but it can happen.  If you remove the master and look at where the rod goes into the housing, there is a c clip there.  Remove that and pull the plunger out.  You will be able to see the seals I am talking bout.  Its really easy.  If you need any help you can call me.  I can walk you thru it all.  I cant remember peoples names or where I have been for the last day but I can rebuild a toyota in my head.  How messed is that.