Black viking 60 At the risk of hard-time in stovebolt jail Iwill tellyou what I done about that vertical cylinder problem. I hope that is right ! See if you can get a ,001 or.002 thousandth SMOOTH feeler gauge between your piston and cylinder rubber cup to let a pocket of air above the bleeder out. It will take some time and don't let fluid get on your brake shoes. See if that might help you ! once your sure its out carefully remove your feeler gauge.