First, check the master cylinder by stomping on the brakes with the engine at idle. If the brake pedal creeps to the floor under steady pressure, you need to replace the master cylinder. If it doesn't creep, then you still have air in the lines that need to be bled out.
I don't know if pushing the pedal to the bottom killed the master cylinder. Some report it can, so maybe that's what happened. I do it all the time though (I take my chances).
95 E320 Cabriolet, 131K