YBR125 motorcycle rear cover assembly, hole position, size and rear brake drum fully match, directly replace the original cover without adjusting the brake system; Including metal cover, brake rocker arm, brake shoe, one-stop replacement of rear brake drum external core components, save the trouble of separate procurement; Preinstalled high quality wear-resistant shoes, stable braking friction, ensure reliable braking effect and long life; The assembly can be completed by aligning the locking screw of the rear brake drum interface, and the operation is simple and efficient.