If the pressure drops, springs result in the clutch to release. Evenly spaced ridges, identified as splines, line the inside and outside with the clutch to lock into the gears as well as the clutch housing. You could browse more about these clutches in How Automated Transmissions Do the job. https://archerqhtht.bloggerchest.com/32941084/examine-this-report-on-clutch-kereta