Hydraulic Brakes

When the brake pedal is depressed, a vacuum builds up in the booster which amplifies the pedal force, pressing on the piston in the master cylinder. The piston raises the hydraulic pressure in the cylinder. This hydraulic pressure is then applied to each respective brake caliper and wheel cylinder, and acts to press the brake pads and shoes against the rotating discs and drums. The resulting friction converts the rotational energy to thermal energy, stopping the vehicle.