303.02.0089 4-circuit protection valve — KNORR-BREMSE

The 4-circuit protection valve serves as a critical component within the pneumatic brake system, managing air pressure distribution across multiple circuits to ensure safety and operational stability. This part is engineered to provide precise pressure regulation, utilizing high-strength components to withstand the rigorous demands of heavy commercial vehicle operations.

303.02.0089 is the OE-equivalent of the KNORR-BREMSE AE 4408 4-circuit protection valve used in heavy commercial vehicle brake systems. This component is specifically designed to maintain optimal pressure differentials across its four circuits, ensuring that any pressure drop in one circuit does not compromise the entire pneumatic system's integrity.

Designed for professional workshop technicians, this valve features specific thread configurations including a M22x1,5 main port and M16x1,5 secondary ports. The technical specifications include an opening pressure of 7 BAR for circuits 21 and 22, and 5,7 BAR for circuits 23 and 24, with corresponding closing pressures of 4,7 BAR. Regular maintenance checks of the pneumatic lines and port seals are recommended during standard service intervals to ensure optimal system performance.