On Monday the 15th of September, LHM Fuel Truck #06 brake failure while traveling down the ramp at A-2 pit. He felt the brakes were starting to have very little effect and attempted to select 1st gear but he could not and the truck speed started to increase (neutral). He then pulled on hand brake and held it on, would not slow truck down. He continued down the ramp and up the adjoining ramp to the -10RL where the truck came to a momentary stop. The truck then started to roll backwards he turned the steering wheel hard right hand down and came to a stop when the high wall was contacted.