The determine displays the vacuum clutch system. This type of clutch utilizes the prevailing vacuum during the motor manifold to operate the clutch. The vacuum clutch is made of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  But let's stay with the subject of automobiles right now! https://alexisxoylv.bloggazza.com/32099163/5-simple-statements-about-clutch-kereta-explained