Abstract: An improved hydraulically actuated brake system for off-road heavy vehicles is disclosed that include a first accumulator, a second accumulator, a first manual and pilot actuated brake valve for controlling the flow from the first accumulator to the front brakes and to a first and a second pressure comparing devices and a second manual and pilot actuated brake valve for controlling the flow from the second accumulator to the first and second pressue comparing devices. The higher pressure from the first and second pressure comparing devices is output to the rear brakes so the front brakes are set by the pressure in the first accumulator while the rear brakes are set by the higher pressure of the first and second accumulators. A separate manually actuated brake valve controls the flow from the second accumulator to a third pressure comparing device which also is connected to receive the output of the first manual and pilot actuated brake valve.