Requirements for brake shoes

The brake shoes of sedans and medium to small-sized trucks, such as light and micro trucks, are widely made of T-shaped section steel rolled or steel plate stamping welding; The brake shoes of medium and large tonnage trucks are made of materials such as malleable cast iron, ductile iron, cast steel, or cast aluminum alloy, and have cross sections in the form of I-shaped or mountain shaped shapes.
The cross-sectional shape and size of brake shoes should ensure good stiffness, but sometimes there are 1 to 2 radial grooves on the steel brake shoe belly plate in small cars, which slightly reduce the bending stiffness of the shoes in order to evenly distribute the contact pressure between the brake shoe friction lining and the brake drum, and reduce the phenomenon of brake squealing.
The thickness of the brake shoe belly plate and flange depends on the vehicle model, which is approximately 3-5mm for sedans and 5-8mm for trucks. The thickness of the friction lining is approximately 4.5-5mm for sedans and over 8mm for trucks.
The friction lining can be riveted or bonded to the brake shoes, and after connection, the outer surface of the friction lining can be machined to the specified size and roughness. The bonding method allows for a larger wear thickness of the friction lining (which can be used up to the limit thickness of only 1-1.5mm), but it is difficult to update the friction lining and generally requires a complete replacement along with the brake; Riveted friction plates are easy to replace and have low braking noise, but their usable thickness is limited by the exposed rivet heads, and they are mostly used for friction plates with a thickness exceeding 6.5mm.