The clutch plate is connected to the gearbox shaft. If the clutch is engaged, the strain plate is pushed away from the clutch plate and therefore disengaged.  At this time, the atmospheric pressure acts on both of those the facet in the piston from the vacuum cylinder, as the vacuum https://clutchplate54196.ageeksblog.com/31998865/5-tips-about-clutch-plate-you-can-use-today