When changing the brake pads, be sure to polish the edges. Generally, when the production of brake pads is completed, a beveled surface is reserved, commonly known as "chamfering". In addition to this "chamfering", it is also necessary to grind the edge position of the entire friction surface. This process is actually noise matching. Because the old brake pads and brake discs have been "lingering" for tens of thousands of kilometers, they have formed a certain complementarity in shape. 

After changing the brake pads, try not to brake vigorously, let alone brake suddenly. Because the friction surface of the new brake pads cannot fully fit the surface of the brake disc. 

After replacing the new brake pads, be sure to pay attention to the running-in, so that the brake pads and the brake discs can be better fitted as soon as possible to ensure the braking effect.