I'm just saying that from what I have seen of stuck calipers brake feel is fine, except you either get pulling, or a horrible metallic screach if the pad is down to the backing.
The caliper would have to blow out completly IE fluid dripping from the wheel in order for the pedal to go to the floor. The original poster said he found no leaks.
Lets see how he fixes it, my bet is still on master cylinder.