The figure shows the vacuum clutch mechanism. This kind of clutch works by using the prevailing vacuum in the engine manifold to operate the clutch. The vacuum clutch includes a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  , by which the facility is transmitted on the gearbox. https://clutchplate87529.qodsblog.com/33047146/the-definitive-guide-to-clutch-plate