First of all, it is necessary to check the brake pad quality, such as whether it is a pure accessory, whether the product packaging is intact, whether the anti-counterfeiting card and packaging mark are consistent with the marks on the brake pad, and whether the product model and certificate content are consistent. Replacement process: First remove the tire, loosen the fastening screws of the tong body, remember to check the screws and the sliding guide rod of the tong body, clean the mud and oil on them, and apply lubricating oil for maintenance. Remove the old brake pads, check the wear degree of the brake discs, and check whether there is a groove or a mess. If the unilateral depth is 3mm, serious wear will occur. At this time, the brake discs need to be replaced. Install the brake pads and all the brake parts to reset the tire. When installing the tire screws, tighten them diagonally, so as to protect the tire and the brake hub. At the same time, check whether the wear of the tire surface and edge is normal. It is recommended that the left and right wheels can be replaced and used regularly, which will help to extend the service life of the tire.