Pedal goes to the floor?

g49bridges said

So let me get this straight...I have front brakes at the very bottom of peddle, but at that point the rears are locking up, so you are saying it could be the rears out of adjustment? I've pulled the e-brake(which functions like it should), and still have the same movement in peddle, if that matters.

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Yes that was the idea, but now that you said you pulled the ebrake and still apparently have the same pedal I have to agree with the bad or not bled master cylinder theory more.

I think Del is on to something with the "plugs" idea.
You could even check the master front and rear function by plugging one or the other of the ports.