Hey i was just wondering if anyone experienced the same problem or knows how to fix the problem that I am having. On long trips, after about and hour and a half of driving an average of 70, I go to brake the the pedal just drops to the floor. There is slight pressure applied on the brakes, but definitly not enought to stop the truck in case of an emergancy. It happens on every single trip, but not durring city driving. After I pump the pedal a few times after it goes to the floor it goes back to normal. Any suggestions?