303.01.0003 Relay Valve — WABCO Compatible

The high-strength Relay Valve is a critical component within the pneumatic brake system, ensuring precise pressure modulation and rapid response during heavy-duty operation. Designed to withstand demanding industrial environments, this part provides reliable control for heavy commercial vehicle braking architectures.

303.01.0003 is the OE-equivalent of the WABCO 973 006 001 0 Relay Valve used in MAN, Mercedes Benz, Scania, DAF, and Renault Trucks systems. It is also compatible with Alexander Dennis and various other heavy-duty vehicle-specific configurations requiring high-grade pneumatic reliability.

For workshop technicians and fleet managers, this component features specific port configurations: Port 1 and Port 2 utilize M22x1,5 VOSS threading, while Port 4 is equipped with an M16x1,5 VOSS connection. The unit is engineered to operate at a maximum pressure of 10 BAR, ensuring stability within the air brake system during standard service intervals.

Maintenance of this relay valve involves regular inspection of the port connections and ensuring no pneumatic leaks occur at the M22 and M16 junctions. Proper installation ensures optimal integration with existing brake-suspension hardware and maintains consistent braking performance across the entire vehicle system.