The clutch master cylinder is a device transforms mechanical force into hydraulic pressure. As the driver presses the clutch pedal, the pedal lever applies force to the clutch master cylinder which transmits hydraulic pressure to the clutch release (slave) cylinder that disconnects engine power to the transmission.

The clutch master cylinder structure consists of an alloy casting and fluid reservoir bottle that bolts to the bulkhead, the internals consist of the piston, cups, and springs, built within the precision machined body.