The figure shows the vacuum clutch system. This type of clutch employs the existing vacuum during the motor manifold to work the clutch. The vacuum clutch includes a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  In the event the clutch is engaged (clutch pedal up) the motor https://beaumtxzd.blogitright.com/33149025/the-smart-trick-of-clutch-kereta-that-no-one-is-discussing