Power steering provides the least effort possible when driving. The power steering system consists of an oil pump, an expansion tank and a pipeline. The oil pump is driven from the engine via a V-belt. The pump draws hydraulic fluid from the expansion tank and delivers it under high pressure to the valve block. The valve block is located on the steering gearbox. It is mechanically connected to the steering shaft and directs the fluid to the corresponding half of the working cylinder, depending on the direction of steering deflection. There, the fluid exerts pressure on the rack piston and thereby maintains the movement of the steering deflection. At the same time, the piston conveys liquid from the other half of the cylinder through the outlet hose back to the expansion tank.
16-valve engines are equipped, in order to better cool the hydraulic fluid, with an additional cooling pipe between the steering gear housing and the reservoir.