I'm no brake expert, but sounds like you have damaged the seals. Can be during reassembly after fixing the blockage, or even using a full pedal stroke during bleeding if it was an old second hand unit. Sometimes a lip forms in the bore (just like a motor) at usual pedal travel over 20 years. When you bleed using a full pedal, the worn edge of the seal gives in and no pedal is the result. I am assuming that you bled the master cylinder, then the system - failing to bleed the master after disassembly will also result in no pedal. Good luck!
Cheers