303.02.0103 4-circuit protection valve — WABCO

The 4-circuit protection valve plays a vital role in maintaining pneumatic stability within the braking system of heavy commercial vehicles. By regulating air pressure across multiple circuits, it ensures that even in the event of a single circuit failure, the remaining system remains operational to maintain vehicle control. This component is engineered with heavy-duty grade materials to withstand the rigorous demands of long-haul transportation.

This specific part is the OE-equivalent of the WABCO 934 714 137 0 4-circuit protection valve used in DAF, ERF, KENWORTH, LEYLAND, MACK, MAN, MERITOR, PACCAR, PETERBILT, VOLVO, and WABCO systems. It is also compatible with DAF 1518193 and ERF 4000795 specifications, ensuring seamless integration into existing pneumatic architectures.

For workshop technicians performing maintenance or repairs, this valve provides precise pressure management. It features specific port configurations including a 1/2" - 14 PTF inlet and three 3/8" outlets (NPTF/PTF) to accommodate standard heavy-duty fittings. Regular inspection of the opening pressure (6,2 BAR) and closing pressure (4,2 BAR) thresholds is recommended to ensure optimal braking performance and safety during service intervals.