Vegas...Welcome 
The only times I have had a brake pedal go to the floor and stay there with no pump up response, is when it involved a failed master cylinder. With most modern brake systems there is a dual hydraulic brake circut so if one part of one circut fails (ie. air in line because of a leaking line or brake cylinder) at least the other two brakes should grab...but it might require some pumping. If the MC is not holding pressure then neither circut will work.
Cheers,
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 FRED
Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K
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