You can adjust the travel of the master cyl pushrod. you'll see a locknut on the pushrod in front of the master cyl. don't take all the freeplay out though. Having said this I doubt that it will help in your case, if the pedal is going to the floor with no resistance it sounds like air in the system or an internal problem with the clutch. Or you could have fluid getting past the seal in the master cylinder and not allow pressure to build. Have you overhauled / replaced this. ? Cheers Tony.