Brake Problems - Won't bleed, leaking out of master

[cedorris]

The last piece of the puzzle before I can drive my truck home is the brakes. There seems to be a problem that we can't quite figure out. The lines won't bleed and they keep pumping fluid out of the rear of the master cylinder.

It's almost like there is damage inside the slave or master cylinder.

Is this something that happens when these trucks have been sitting for too long? It was working great 4 years ago - but that was 4 years ago.

Any help would be appreciated! Thanks.

1972 Chevy Super with Brake Booster