Air brake filters are critical components within heavy-duty vehicle pneumatic systems, removing contaminants like water, oil, and particulate matter from compressed air. Typically located within the air dryer assembly, these filters protect downstream components – including valves, actuators, and air bags – from abrasive wear and malfunction. Filter elements utilize various media, such as cellulose, synthetic fibers, or sintered bronze, with micron ratings specified for optimal filtration efficiency. Coalescing filters further enhance water removal by forcing moisture to combine into larger droplets and drain from the system. Regular replacement is essential to maintain consistent braking performance and prevent system failures.