The figure demonstrates the vacuum clutch system. Such a clutch uses the existing vacuum from the motor manifold to work the clutch. The vacuum clutch is made up of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  The greater number of friction surfaces also boosts the potential https://johnnykzluf.glifeblog.com/32057925/a-review-of-clutch-kereta