I was driving north on Hwy 60 just south of the Hwy 73 turnoff in Arizona. It was a windy mountain road. I was approaching a vehicle from behind and took my foot off the gas and hit the brakes. Nothing - Nothing. I started pumping the brakes to the floor - still nothing. I was able to adjust my position on the road and travel between the two lanes of traffic - one northbound and the other southbound. I did slightly clip another vehicle. My truck rolled into a stop several miles later. When I was almost at a complete stop - the brakes finally engaged and the vehicle stopped. From where I stopped - it was a flat drive into Showlow, AZ and there was no cell service where I was. I drove at appx 40-45 mph with my emergency flashers along the right side of the road. The truck is sitting on my lot in Lakeside, AZ and has not yet been taken to the dealer for service. Several things to note: I have no recollection of the incident after the initial brakes failed and I took corrective action. My next memory was rolling to a stop on the side of the road. Right after the incident, which driving into town, I suffered a stroke and drove to the hospital. I was released 24 hours later and have since returned to Phoenix. The truck is still in Lakeside awaiting repair.