The figure shows the vacuum clutch system. Such a clutch utilizes the prevailing vacuum while in the engine manifold to operate the clutch. The vacuum clutch is made of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  Their purpose is to connect or disconnect the engine to https://manuelrfrqo.goabroadblog.com/32170351/clutch-plate-fundamentals-explained