Brakes - No Brakes

TX77705 wrote:
We were traveling on i81 near Roanoke VA in heavy stop and go traffic, on a very hot day, and decided to pull off to fuel up at a nearby Pilot. Brakes were fine up until we pulled up to pump to refuel. After refueling, we started to drive away when I felt the brake pedal go all the way to the floor. Luckily I was able to apply the e-brake and got the rig stopped. No dash lights came on to indicate any brake trouble, and a check of the brake fluid reservoir showed it full and no leaks. At this point, we called GS Roadside Assist for help (completely useless I might add, but that's another story), and after many calls back and forth the final outcome was that we were going to have to spend the weekend boondocked at this Pilot filling station. We settled in for the night, but after dark I thought I would give the brakes another check and found them to be working again. Back on the road, we completed our journey without further incident. Will have the rig into service tomorrow to have everything checked out, but wondering what could have caused this problem? Anyone have any similar experience or idea as to what could have caused this?