Built around power-drive unit assembly, RunWise hydromechanical, hybrid system recovers brake energy and stores it to be used later. Energy is recovered when system is in hydrostatic mode and brakes are applied. Upon braking, RunWise controller commands hydrostatic motors to become pumps, and brakes vehicle by converting vehicle inertia into stored, high-pressure energy in accumulators. System is intended to operate in environments of -40 to +120°F on vehicles in excess of 70,000 lb.