The figure demonstrates the vacuum clutch mechanism. Such a clutch takes advantage of the existing vacuum within the engine manifold to function the clutch. The vacuum clutch consists of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  These types of clutches consist of significantly less rigid springs, https://travislmkii.wizzardsblog.com/32978207/5-easy-facts-about-clutch-kereta-described