Automobile Engineering in ME
The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads
Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads
Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads
Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads

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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
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

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