[Capri306]

I agree completely with Lethal5Oh, with these additions:

It doesn't take much crap to plug the system, that's for sure. Even a little hunk o' gunk in the proportioning valve...no, wait, especially a miniscule hunk o' gunk in the proportioning valve can screw it up. The passages in there are small, so if you don't get fluid up to there, you may have to tear it down & rebuild or at least clean it thoroughly using brake fluid or brake parts cleaner ONLY (anything else will degrade the rubber in the system). That's assuming a functioning master cylinder....speaking of which, since a master cylinder is so cheap, why the fudge didn't you just replace it with a new one, considering how cheap they are, and how old the one you're working with is???