303.02.0078 KNORR-BREMSE 4-circuit protection valve

This high-strength component plays a critical role in the pneumatic brake system by managing air distribution across multiple circuits to prevent total system failure. Designed for heavy commercial vehicle applications, the valve ensures that even if one circuit loses pressure, the remaining circuits maintain sufficient function for safe operation. It is built with heavy-duty grade materials to withstand rigorous pressure cycles and environmental stresses.

303.02.0078 is the OE equivalent of the KNORR-BREMSE AE 4180 4-circuit protection valve used in heavy commercial vehicle braking systems. This part is engineered to meet strict technical specifications, featuring an M22x1,5 main port and four M16x1,5 auxiliary ports, ensuring a precise fit within the pneumatic architecture of compatible braking hardware.

Workshop technicians can rely on the stable pressure thresholds of this unit, which features a consistent 7 BAR opening pressure and a 4,5 BAR closing pressure across all four circuits (21, 22, 23, and 24). Regular inspection of the port connections and seal integrity is recommended during routine maintenance to ensure long-term reliability of the pneumatic braking circuit. The assembly is designed for efficient integration into existing heavy vehicle braking modules.