Your description is real hard to follow, but a common cause of a slowly-sinking brake pedal is a bad master cylinder. Also, regardless of what caused the pedal to go to the floor, doing so will usually damage the master cylinder. Crud and corrosion build up in the lower halves of the bores where the pistons don't normally travel. Pushing the brake pedal over halfway to the floor runs the rubber lip seals over that crud and rips them. That results in a low or slowly-sinking pedal, but often that doesn't show up for two or three days.
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Monday, October 19th, 2015 AT 7:25 PM