Different from pneumatic clutch master cylinder,hydraulic clutch servo system transmits by oil inside pipe
When we trend the pedal, giving a force to piston of master cylinder, pressured oil from oil tank flows into master cylinder chamber , compress the spring and transmit the force to slave cylinder across oil inside pipe
When the oil full fills with slave cylinder chamber, will force the piston forward, transmit sensor pin to touch with clutch ,so that it can separate
After this cycle, oil flows back to master cylinder, and spring will also back to its original type.by the way, when the oil contains some air inside, the pressure increase too high to force the exhaust valve open to release
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