Is there remnants of fluid on the rims? You may need to replace the calipers.
The feeling when it goes right to the floor means that all that fliud is leaving(finding some way out). So it could be bad hose, leaky calipers, hoses that aren't on correctly. Even if you had air in the lines the car would still stop. The pedal would feel swashy and not work well but you would have something.