The figure reveals the vacuum clutch mechanism. This type of clutch takes advantage of the existing vacuum from the engine manifold to function the clutch. The vacuum clutch consists of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  But let's stay with the topic of automobiles these https://clutch-plate81357.topbloghub.com/39366437/not-known-details-about-clutch-plate