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I had a problem like that with my first car ('78 Monte Carlo). The problem turned out to be the master cylinder. Swapped it out and all was good thereafter. Might be worth looking at...

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That is my guess as well. I had to replace mine last year. I bet if you look at it you will see where brake fluid has leaked from between the booster and master cylinder. There is a seal on the back of the master cylinder and mine went bad causing the leak.

I didn't have the brake pedal going to the floor problem. Mine is a 5 speed and I would get a hard clutch pedal because the clutch master cylinder feeds of the brake master cylinder.