A clutch port (commonly known as a compensating port or fluid inlet port on a clutch master cylinder) controls the flow of hydraulic fluid between the fluid reservoir and the master cylinder bore.
Main Functions
• Fluid Replenishment: It allows hydraulic fluid to enter the master cylinder bore to keep the system fully topped up.
• Wear Compensation: As the clutch disc wears down over time, the port lets extra fluid flow in or return so the system self-adjusts to maintain proper pedal feel and free play.
• Thermal Expansion Relief: As hydraulic fluid heats