The figure shows the vacuum clutch mechanism. This sort of clutch takes advantage of the prevailing vacuum from the engine manifold to operate the clutch. The vacuum clutch consists of a reservoir, non-return valve, vacuum cylinder with piston, and solenoid valve.  Salah satu kemungkinan penyebab adalah adanya kebocoran pada clutch https://clutch-kereta86418.blogolenta.com/29951104/new-step-by-step-map-for-clutch-plate