Automobile Engineering in ME
The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Boost the force applied to brake pedal
Adjust the extent of brake pedal free play

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Increases the combustion temperature
Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Creates swirl
Maintains a seal and prevents the fuel leakage

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