A brake is a component in a braking system that is used to generate braking force that hinders the movement or trend of a 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.

The brake drum is the friction coupling of the drum brake. In addition to the strength and stiffness required as a component, it should also have the highest possible and stable coefficient of friction, as well as appropriate wear resistance, heat resistance, heat dissipation and heat capacity.The basic shape of the brake drum is drum-shaped, with connecting holes on the mounting surface.

A typical drum brake is mainly composed of a base plate, a brake drum, a brake shoe, a brake wheel cylinder (brake sub-pump), a return spring, a positioning pin and other parts.The bottom plate is installed in a fixed position on the axle, it is fixed, and it is equipped with brake shoes, wheel cylinders, return springs, and positioning pins to withstand the rotating torque during braking.Each drum has a pair of brake shoes, and there are friction liners on the brake shoes.The brake drum is mounted on the rim and is a part that rotates with the wheel. It is made of cast iron of a certain weight and is shaped like a round drum.

The drum brake stops the tire from rotating. It uses hydraulic pressure to be transmitted from the master cylinder to the wheel cylinder to depress the top of the brake shoe to the brake drum, which rotates with the tire.When the hydraulic pressure on the wheel cylinder disappears, the force of the return spring pushes the brake shoe away from the inner surface of the brake drum and returns to its original position.

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