303.02.0079 KNORR-BREMSE Compatible 4-circuit protection valve

The heavy duty 4-circuit protection valve is a critical component within the pneumatic braking system of heavy commercial vehicles. Its primary function is to regulate air pressure across multiple circuits, ensuring that the braking performance remains stable and responsive even during pressure fluctuations or potential system leaks. Constructed with high-strength components, this part is designed to withstand the rigorous operational environments typical of heavy-duty transport applications.

This specific model is the OE-equivalent of the KNORR-BREMSE AE 4185 4-circuit protection valve used in professional braking systems. It provides precise control with an opening pressure of 7 BAR and a closing pressure of 4,5 BAR across ports 21, 22, 23, and 24. This ensures that the pneumatic signals are transmitted accurately to maintain vehicle control and safety.

For workshop technicians performing maintenance or repairs, this valve offers reliable assembly through its standardized port sizes: one M22x1,5 inlet and four M16x1,5 outlets. Regular checks of the connection points and pressure thresholds are recommended during routine service intervals to ensure the integrity of the entire brake system. Proper installation ensures the component integrates seamlessly with existing KNORR-BREMSE hardware and compatible heavy commercial vehicle architectures.