Air dryer assy combines functionality with reliability, with its primary function being the purification of brake air supply to ensure braking performance. Its core components include a highly efficient drying cylinder and a precision filter screen. Its working principle lies in absorbing moisture and removing impurities to maintain the purity of the air. Its importance is self-evident, as it directly relates to driving safety. The maintenance essentials involve regular inspections and timely replacements to prevent malfunctions. It is widely applicable to various types of heavy-duty trucks. Its performance standards are stringent, ensuring efficient dehumidification and filtration.