Clutch Master Cylinder
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
The clutch master cylinder generates the system pressure required to actuate the clutch. When the clutch pedal is pressed, the piston rod moves the clutch master cylinder piston. The hydraulic fluid in the clutch master cylinder is forced through the high-pressure tube to the clutch slave cylinder.