Try this,,, pump the brakes until you get some pedal feel. If the pedal slowly goes to the floor while you have pressure on the pedal or if you let up a LITTLE and then press back down on the pedal and it goes to the floor the seals inside the master cylinder are toast frown
DO NOT DRIVE IT until you get it fixed/rebuilt or otherwise. I would hate to hear that you lost the brakes completely and crashed your truck and you eek

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!