303.02.0028 4-circuit protection valve — IVECO

This specialized 4-circuit protection valve is engineered to maintain precise pneumatic control within the braking system of heavy commercial vehicles. It manages pressure distribution across multiple circuits to ensure safety and system stability during operation. Constructed with heavy-duty grade materials, the component is designed to withstand high pressure fluctuations and rigorous driving conditions.

303.02.0028 is the OE equivalent of the IVECO 98400429 and KNORR-BREMSE AE 4646 / K019909N00 systems used in heavy commercial vehicle braking architectures. This part ensures seamless integration with professional braking systems, providing reliable performance for fleet managers and workshop technicians who require exact technical specifications for maintenance and repair.

For the workshop technician, this valve offers a precise fit with specific opening and closing pressure thresholds: Port 21/22 opens at 7,5 BAR and closes at 6,5 BAR, while Port 23/24 opens at 8 BAR and closes at 6,5 BAR. The maximum operating pressure reaches up to 20 BAR, ensuring durability under heavy loads. Regular inspection of the M22x1,5 and M16x1,5 port connections is recommended during routine brake system service to ensure optimal pneumatic seal integrity.