Brakes Released
WARNING: This page does not describe the selected car, but rather 26 other vehicles, including the 1992 GMC Yukon, 1992 GMC Vandura Special, 1992 GMC Vandura, 1992 GMC Value Van, and 1992 GMC Suburban. However, it is still accessible from the selected car via links, so may be relevant.
With pedal released, spool valve return spring holds spool valve open. Spool valve allows fluid flow between power steering pump and power steering gear.
Fluid pressure is blocked from entering boost pressure chamber by lands on spool valve. Boost pressure chamber is vented through spool valve, to pump return port, and back to power steering pump.