Brakes will not pressurize after replacing the brakes

My car started shuddering when pressing the brakes. So, I changed the pads and rotors. The calipers appeared to be okay but after about fifty miles they became stuck, so I replaced them too. I've bled them numerous times, there's no air in the tube. It's all solid brake fluid. I've even bled the back ones too. I also switched the calipers thinking maybe I installed them on the wrong side. I bled them again and I still don't have any brakes. After the bleeder valves are tight and the fluid topped off and I start the car they go straight to the floor. What am I missing?