Most of the reasons are brake pads, and there are also reasons that the material of the brake discs is uneven or the balance error is large or the wear is abnormal, and the reason that the brake cylinder does not return causes the friction plates to carbonize the friction surface resin due to the high temperature. Brake pads are generally caused by 1 brake pads being worn down to the steel back or brake shoes. 2 Brake pads appearing on the surface of the friction material. Large particles of high hardness. 3 Brake pad wear resulting in excessive arc 4 Brake pads stained with oil impurities etc. 5 Some brake pads are used The high temperature over recovery produces a high coefficient of friction. 6 The brake pads themselves are of a material with a high hardness. 7 The brake pads are made of high-hardness fillers. 8 After the brake pads are braked at high temperatures, a bright, hard carbonized film forms on the work surface, causing high frequency vibration during braking. And noise. Brake Pad Cause Solution The brake pad is chamfered on the surface and replaced after invalid.