What is the working principle of the clutch master pump?

The working principle of the clutch master pump is: after the clutch pedal is pressed, the push rod pushes the master pump piston to increase the oil pressure, the gasoline enters the slave pump through the hose, and the slave pump pull rod pushes the release fork to push the release bearing forward. After the clutch pedal is released, the hydraulic pressure is released, and the release fork returns to its original position under the action of the return spring, so that the clutch is in the engaged state. The clutch master pump is the part connected to the clutch booster through the oil pipe, and its function is to separate the clutch through the booster.
The maintenance method of the clutch master pump is: 1. Inject hydraulic oil into the pump; 2. Loosen the bleed bolt and push the piston to let the air in the pump overflow; 3. Fix the bleed bolt.