Seriously there must be air in there mate, mine did the EXACT same thing when i fitted mine and i was stressing to the max over it, i did everything while i was trying to rememdy it and when i did this they started working.

Admittedly they aren't the best, there is a fair bit of travel in the pedal, but they work and passed the MOT, where as before the pedal hit the floor with just a hint of braking when on the floor.......

What size is your master cylinder?