[slyalfa]

If the pedel goes to the floor I think the master is bad, working pump or not, working accumulator or not.
the pedel should not sink. I have had to change the master once when that started to happen to me.
As far as I know no one has a seal set for it so you have to find a new/used one.
checking for air one last time will not hurt. Did you blead the back too? that one is easy just put a stick on the pedel so it is part way pushed.(I slide the seat forward to push the stick) and then go back and open each of the bleaders one at a time the pump will flow as much as is needed. keep the tank full. it is good to let it run a bunch to clean out the old.

P.S. the key needs to be on