Learn about Hydraulics in this educational video from dizzo95.
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Male Speaker: Of the two common braking systems use in automobiles disc brakes, and drum brakes. The disc system is the more reliable. Disc brakes work on the principle of applying friction to a rotating disc. The brake has three major elements a cast-iron disc that is attached to the wheel, brake pads on both side which apply friction, and a hydraulic piston that pushes each pad against the disc. When a break pedal is stepped on hydraulic foot is forced from the master cylinder to the slave cylinders at each wheel. Hydraulic system is used because the levers pressure equally to all wheels. The pressurized fluid pushes the slave pistons which in turn push the brake pad against the rotating disc. The greater the pressure the harder the pads rub the faster the breaking.

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