The figure displays the vacuum clutch system. Such a clutch takes advantage of the prevailing vacuum in the engine manifold to operate the clutch. The vacuum clutch is made up of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  Most of these clutches encompass significantly less stiff https://clutchkereta97579.ssnblog.com/32170310/an-unbiased-view-of-clutch-plate