On the subject of safety, brakes are amongst the most important components of a vehicle. Pneumatic braking systems on trucks and buses must be protected from corrosion to ensure efficient operation. To achieve this, a dry, clean pneumatic operating system is of critical importance. The air drying box ensure maximum operating safety of the brake system since dry air is the only reliable way to prevent corrosion and freezing in the pressure brake system. This filter filters out dirt particles and oil and provides optimum air drying performance.