The brake is a component used in the braking system to generate braking force that hinders the movement or movement of the vehicle. At present, the friction brakes widely used in various types of automobiles can be divided into two categories: drum type and disc type according to the different rotating elements.

Wheel hub: Wheel hub is also called rim, tire bell, and wheel. It is a metal part that is barrel-shaped and the center is mounted on the shaft. The wheel hub is based on the length of the diameter, the width, and the difference in molding methods., Different materials used are divided into many different types.

The scientific name of the brake hub is the brake drum, or brake drum for short. It is the main component of the drum brake system. When braking, the friction between the inner surface of the brake drum and the brake pads acts as a brake.

Support the hot brake drum with a jack, charge the air pressure to more than 8kg, step on the brake, and then release the brake. If the brake adjustment arm of the brake drum cannot be returned in time

Brake drums are used only for low-end cars or trucks and buses. It is a part of the drum brake system. When braking, the piston exerts pressure on two pairs of half-moon brake shoes to make them close to the inner wall of the drum, thereby generating friction to stop the rotation of the wheel,