Brake pads are eccentric, the main reason is that the brake calipers are stuck and braked. The piston of the pump is not synchronized (for drum brakes), and the guide pin is lubricated back. Stuck. The effect is to reduce the braking efficiency and shorten the service life of the brake pads. Produces noise. Solution: Check the brake cylinder and guide pin return position, use the brake Car depth maintenance kit cleaner to clean the brake caliper or lubricate the sub-pump and guide pin, replace Brake pad.