303.02.0071 KNORR-BREMSE 4-circuit protection valve

This 4-circuit protection valve is a critical component within the pneumatic brake system of heavy commercial vehicles, designed to manage air distribution across multiple circuits. Built with high-strength components, it ensures the stability of braking pressure even under demanding operating conditions. The valve manages complex pressure transitions to maintain optimal safety during transport.

303.02.0071 is the OE-equivalent of the KNORR-BREMSE AE4452 4-circuit protection valve used in heavy commercial vehicle brake systems. This part is engineered for precise compatibility with KNORR-BREMSE hardware systems to ensure seamless integration and reliable performance in professional workshop environments.

The technical configuration includes a primary Port 1 (M22x1,5) and several secondary ports (M16x1,5) including ports 11, 12, 21, 22, 23, and 24. The device operates with a maximum pressure of 10 BAR, featuring specific opening pressures (e.g., 6.9 BAR for ports 21/22 and 7.5 BAR for port 24) to maintain system integrity during various driving phases.

For workshop technicians, regular inspection of the port seals and pressure thresholds is recommended during routine brake system maintenance. Ensuring that the opening and closing pressures align with the vehicle's technical specifications is essential for preventing pneumatic failures and ensuring long-term component durability.