303.02.0098 4-circuit protection valve — KNORR-BREMSE

The heavy duty 4-circuit protection valve is a critical component within the pneumatic brake system of heavy commercial vehicles. Designed to manage air pressure distribution across multiple circuits, this component ensures that even if one circuit experiences a leak or failure, the remaining air supply remains stable to maintain braking functionality and safety.

303.02.0098 is the OE-equivalent of the KNORR-BREMSE AE 4459 4-circuit protection valve used in heavy commercial vehicle braking systems. This part features a specialized configuration with one M22x1,5 port and four M16x1,5 ports (Ports 21, 22, 23, and 24) to ensure precise pneumatic control and high-strength performance under demanding conditions.

For the workshop technician, this unit provides a reliable solution for maintaining braking system integrity. The valve operates with an opening pressure of 6,5 BAR and a closing pressure of 4,5 BAR across all secondary ports (21 through 24). Regular inspection of the port seals and pressure thresholds is recommended during routine heavy commercial vehicle maintenance to ensure optimal system response.

This component is engineered with high-strength components to withstand the rigorous vibrations and pressure fluctuations typical in heavy commercial vehicle environments. It is essential for maintaining the safety of the pneumatic circuit during long-haul operations.