The figure shows the vacuum clutch mechanism. This sort of clutch works by using the existing vacuum in the engine manifold to function the clutch. The vacuum clutch includes a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  In the event the clutch pedal is pressed, a cable https://angeloggdbz.ttblogs.com/12661205/the-ultimate-guide-to-clutch-plate