Hydraulic Clutch Operation

A hydraulic clutch is often used where the configuration of the drivetrain and cockpit doesn't easily allow for the use of linkages or cables. It is also more responsive than a mechanically operated clutch. The system consists of a master cylinder (left) with a fluid line connecting the slave cylinder. When the driver presses the clutch pedal, a rod connected to the master cylinder pushes the master's piston down, forcing fluid (shown in red) through the fluid line to the slave cylinder. The slave cylinder's piston forces its rod against the release bearing lever, moving it enough to release pressure from the clutch's pressure plate. Note the mechanical advantage gained by the longer stroke and smaller bore of the master cylinder compared to the slave cylinder. ---------------------------------- Here, air has entered ths slave cylinder. Because air can be compressed, the stroke of the master cylinder is wasted compressing the air in the slave cylinder without moving the slave's piston. This air must be bled from the system before it will operate as designed.