A brake is a device that has the function of slowing down, stopping or maintaining a stationary state of moving parts (or moving machinery). It is a mechanical component that stops or reduces the speed of moving components in a machine. It is commonly known as a brake or a brake pedal. A brake is mainly composed of a base frame, a braking component and an operating device. Some brakes also have an automatic adjustment device for the gap of the braking component. To reduce the braking torque and the structural size, brakes are usually installed on the high-speed shaft of the equipment. However, for large equipment with high safety requirements (such as mine hoists, elevators, etc.), they should be installed on the low-speed shaft close to the working part of the equipment.