Check if the screws of the JJRC C8805 RC Car’s swing arm connecting with the frame and wheels are loose, if so, re-tighten the screws. Check to see if the swingarm ball head is badly worn; if the ball head is worn, replace it with a new ball head assembly. In addition, check whether the shock absorber is working properly, shock absorber failure may lead to abnormal swing arm swaying, repair or replace the shock absorber in time.