I've had the same problem before. I think part of it is bad rebuilt MCs,
part of it is the remote resevior (the fluid dosen't drain down properly).
I solved the problem on Annie by using a '65 Baracuda master cylinder. :-)
Of course, you have to fill it behind the tire, but that's not a problem
'cause there is lots of clearence with it raised so high.
~ Paul
aka "Tha Driver"

If guns cause crime, all of mine are defective.