How does a power-assisted steering rack work?
A power-assisted rack reduces the effort required to steer the wheels. A power rack is nothing more than a manual rack with a hydraulic chamber and some valves. High-pressure fluid from the power steering pump enters the rack and is routed through ?spool valves? connected to the steering column. When the driver turns the steering wheel, the spool valves open ports that direct pressure to the hydraulic chamber. A piston on the rack bar divides the chamber into two halves, and pressure is channeled into one side or the other depending on which way the diver is turning. This provides power assist and helps push the rack bar in the desired direction.
