I got into my truck today to go to the store and went to stop, and the brake pedal went 3/4 to the floor and began to choke.

While driving, the pedal feels normal, but the pedal fades to the bottom once again as you add to pressure.

If you make a quick brake check to the floor, it will stop but lock up?

I didn't check the fluid before driving, but afterward, when i got home, I did, and it appears complete.

I also don't see any leaks in the snow or on any wheels.

I'm leaning towards the master cylinder failing.

Does anybody else have this issue?

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