A #disc #brake is a type of brake that uses calipers to squeeze pairs of pads against a rotor (or “disc”) in order to create friction that retards the rotation of a shaft, such as a vehicle axle, either to reduce its rotational speed or to hold it stationary. The energy of motion is converted into waste heat which must be dispersed
When you press on the brake pedal, your foot moves a lever that forces a piston into a long, narrow cylinder filled with #hydraulic fluid. As the #piston plunges into the cylinder, it squirts hydraulic fluid out through a long and narrow pipe at the end . The narrow pipe feeds into much wider cylinders positioned next to the car’s four brakes. Because the cylinders near the brakes are much wider than the one near the brake pedal, the force you originally applied is multiplied greatly, clamping the brakes hard to the wheels .