[Lynn Eades]

Hanno, I believe you have the pressure thing the wrong way around.
Harry, may I suggest that if the master cyl. was bled carefully the cup should never travel that far down the bore. Not to offend, just that the m/cyl should be bled first off the vehicle, and then with short pedal strokes until the air is gone.
I believe this is a std practice these days, otherwise all the internals get hammered.
The seal that goes at the end of the bore, should be pushed down the hole straight until the end and then tipped over past the hole.