303.02.0057 KNORR-BREMSE Multi-circuit Protection Valve

The 303.02.0057 multi-circuit protection valve serves a critical role in the pneumatic brake system of heavy commercial vehicles, ensuring that air pressure is distributed safely across multiple circuits. This component is engineered to maintain circuit integrity, providing essential safety functions by managing pressure differentials and preventing total system failure in the event of a leak.

303.02.0057 is the OE equivalent of the KNORR-BREMSE AE 4562, K050701N00, and K050701N50 multi-circuit protection valves used in heavy commercial vehicle braking systems. This part is engineered to meet strict technical standards, featuring specific opening pressures for various ports to ensure optimal performance and reliability during operation.

For workshop technicians, this valve features specific port configurations: Port 21, 22, 23, and 24 utilize M16x1,5 threads, while Port 25, 26, and 28 utilize M22x1,5 threads. Installation requires careful attention to the specified opening pressures—such as the 7,4 BAR requirement for Port 24—to ensure the pneumatic system operates within safe limits. Regular maintenance checks of the port connections and pressure thresholds are recommended to maintain long-term system stability.