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

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

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Automobile Engineering in ME
The advantage of having a tandem master cylinder arrangement in automobiles is that it

Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss
Enhances safety by serving two independent lines in a divided line brake circuit
Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side
Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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