I just installed a rebuilt master cylinder in the 65 Dart yesterday and I can't pump the brakes up to bleed them. The old mc worked, but sometimes the pedal would go to the floor, then pump back up. Bled the brakes, no air, so I figured it was the mc. The new lone won't even pump up at all. Bench bled it per instructions first,no bubbles. Had the wife helping me. If I plug the mc with the supplied plug the mc will build some pressure, but as soon as I attach the line it looses all pressure. I don't seen any leaks and like I said, the brakes worked before. I'm thinking bad mc.....any other opinios? What am I missing? Thanks Jeff Adams 64 Polara ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.