303.02.0082 KNORR-BREMSE 4-circuit protection valve

The heavy-duty 4-circuit protection valve is a critical component within the pneumatic braking system of heavy commercial vehicles. It serves to manage and isolate air pressure across multiple circuits, ensuring that a failure in one line does not compromise the entire braking performance. Designed with high-strength components, this part maintains precise pressure regulation to support the safety and stability of the vehicle during operation.

303.02.0082 is the OE-equivalent of the KNORR-BREMSE AE 4188 4-circuit protection valve used in heavy commercial braking systems. This component is designed for seamless integration into professional brake system architectures, meeting strict technical standards for pressure thresholds and port configurations. The part features a primary port of M22x1,5 and four secondary ports (Port 21 through Port 24) sized at M16x1,5 to facilitate reliable pneumatic connections.

For workshop technicians and fleet managers, this part offers a precise fit for maintenance and replacement tasks. The technical specifications include an opening pressure of 7 BAR for ports 21 and 22, and 6,5 BAR for ports 23 and 24, while the closing pressure is standardized at 4,5 BAR across all outlets. Regular inspection of the pneumatic lines and connection points is recommended during routine brake system service to ensure the valve operates within its intended functional parameters.