Rear brakes are not bleeding.

Test the system one component at a time. Start with the master cylinder. With both ports on the master cylinder plugged and bled observe the compensator ports in the master. You should see movement of fluid from the compensator ports when the pedal is applied and when it is released. If the pedal " bricks " crack a plug one at a time and see if pressure releases. If cracking the plug at a port releases pressure then make sure the linkage is 100% retracted and not keeping the piston from returning all the way. If the master is working properly then when the pedal is released the piston retracts and uncovers both the front and rear compensator ports and no pressure will remains in either port. If this part of your system isn't working then neither will the rest of the system. Good luck!