Clutch Master Cylinder: Description and Operation

CLUTCH MASTER CYLINDER





When Not Operating
As the piston is pushed to the right as shown in the figure by the return spring force, no hydraulic pressure is generated in the chamber "a". The spring force also compresses the seal cup spring, opening the oil passage between the reservoir and the chamber





When Operating
Depressing the clutch pedal causes the piston to move to the left as shown in the figure, thereby the piston return spring is compressed. Then the seal cup, by its own spring force, closes the oil passage between the reservoir and the chamber "a". Immediately after this closure, hydraulic pressure is generated in the chamber "a" and it is applied to the operating cylinder on the transmission.