why is hydraulic fluid (liquid) used to operate brakes in car ????
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It is used to transfer force under pressure from where it is created through hydraulic lines to the braking mechanism near the wheels. It works because liquids are not appreciably compressible.
Brake shoes supply the necessary friction to stop a car's wheels from spinning. Brake fluid under pressure is what supplies the force necessary to squeeze the brake shoes against the rotating insides of a car's tires. A mechanical braking system in contrast, as used on bicycles, uses cables to squeeze the brake shoes against the tires; hydraulic braking systems use brake fluid to operate the brake shoes.
Brake shoes supply the necessary friction to stop a car's wheels from spinning. Brake fluid under pressure is what supplies the force necessary to squeeze the brake shoes against the rotating insides of a car's tires. A mechanical braking system in contrast, as used on bicycles, uses cables to squeeze the brake shoes against the tires; hydraulic braking systems use brake fluid to operate the brake shoes.
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Answer:
The particles in a liquid (the brake oil) can move freely without being compressed much and hence transmit the pressure applied on brake pedal to the brake drum (on moving wheel) efficiently
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