I have bled them by removeing one piston & sticking a small screwdriver in the top of the cup. That will only work when the rest of the system has not been opened or the master cyl get low. It also will only work when the master cyl. is on the firewall & you can gravity bleed it. You should go ahead & get new cyls. Bleeders & mounting bolts break pretty often around here as we are in the rust belt.
