I was just pulling out of a parking lot onto a busy hwy and my brakes went completely out! The brake pedal went all the way to the floor and didn't stop the truck. Thank God the truck came to a stop before I rolled into the oncoming traffic. Anyone have any ideas on what it could be? It was complete brake failure. I checked the lines for leaked but everything looked ok and there is plenty of brake fluid in the tank. When I mash the pedal now it just goes to the floor. Any help is greatly appreciated.