303.02.0083 4-circuit protection valve — KNORR-BREMSE

This 4-circuit protection valve is a critical component within the pneumatic braking system of heavy commercial vehicles. Its primary function is to maintain air pressure across multiple circuits, ensuring that a failure in one circuit does not compromise the entire braking system. Engineered with high-strength components, it provides reliable pressure regulation and stability under demanding operational conditions.

303.02.0083 is the OE equivalent of the KNORR-BREMSE AE 4190 4-circuit protection valve used in heavy commercial vehicle brake systems. This part is specifically designed to meet the technical requirements of high-pressure pneumatic environments, ensuring seamless integration with existing brake hardware.

For workshop technicians, the installation process requires precise attention to port specifications: Port 1 features an M22x1,5 thread, while Ports 21, 22, 23, and 24 utilize M16x1,5 threads. The valve activates at an opening pressure of 7 BAR and closes at 4,8 BAR across all four circuits. Regular maintenance of the pneumatic lines and checking for leaks around the threaded connections is recommended to ensure optimal system performance and safety.