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

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 activating the brakes using vacuum pressure in the event of brake fluid loss
Boosts the brake fluid pressure to reduce the force required to depress the brake pedal
Enhances safety by serving two independent lines in a divided line brake circuit

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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Reduce the amount of noise generated
Reduce the amount of sliding resistance
Improve the force transmission speed
Can deal with movement of the suspension both vertically and in other directions

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