The heat insulation layer is made of non-heat-conducting materials for the purpose of heat insulation. The friction block is made of friction material and adhesive. When braking, it is squeezed on the brake disc or brake drum to produce friction, thereby achieving the purpose of deceleration and braking of the vehicle. Due to friction, the friction block will gradually wear out. Generally speaking, the lower the cost of the brake pad, the faster it wears. After the friction material is used up, the brake pad should be replaced in time, otherwise the steel plate will come into direct contact with the brake disc, which will eventually lose the braking effect and damage the brake disc.