Upper swing arm rubber sleeve

An Upper Swing Arm Rubber Sleeve is a protective dust boot or cover designed to shield the ball joint on the upper swing arm (control arm) of a vehicle's suspension system. In Tesla models, this sleeve is typically made from durable, flexible rubber or polyurethane and is filled with grease to lubricate the ball joint. Its primary functions are to prevent contamination from dirt, water, and debris, and to retain lubrication, ensuring the smooth operation and longevity of the ball joint. A torn or damaged sleeve can lead to premature wear, corrosion, and failure of the ball joint, resulting in clunking noises, poor alignment, and compromised handling.