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

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

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

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

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