Reserve System

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.

System consists of charging valve, accumulator valve and spring-loaded accumulator. Accumulator is integral with booster. System is open to pressure port of booster.

Charging valve has an orifice and ball check valve. Fluid from pump passes through orifice in valve, unseats ball check valve and enters accumulator. Ball check valve prevents reverse flow.

Accumulator valve is poppet-type valve held closed by accumulator pressure. If no pump pressure is available, an actuator on spool valve sleeve opens accumulator valve. Fluid pressure can also enter accumulator from boost chamber through accumulator valve, when boost chamber pressure exceeds accumulator pressure.

Pressure relief valve vents accumulator to pump return port when pressure in accumulator exceeds approximately 1600 psi (112kg/cm² ).