The back bleed trick I explained will verify that lines are open. The brake system is designed to move Brake fluid, not air. Until you get the system full of fluid you CANNOT diagnose a problem. As a professional mechanic I see similar brake problems on a regular basis. I am not saying you don't have a problem with a cylinder but I am telling you to do a few minutes of work to pinpoint the problem. You don't carve out your appendix just because you get a stomach ache. You don't rip out your tonsils just because you have a sore throat. Do the proper preliminary research.
Where are you located? Maybe I or someone else could lend a hand.
Where are you located? Maybe I or someone else could lend a hand.