303.02.0101 4-circuit protection valve compatible

This 4-circuit protection valve is a critical component within the pneumatic brake system of heavy commercial vehicles, ensuring regulated air pressure distribution across multiple circuits. Designed with heavy-duty grade materials, it provides the necessary reliability for professional workshop applications and fleet maintenance.

303.02.0101 is the OE-equivalent of the WABCO 934 714 123 0 4-circuit protection valve used in DAF, VDL, and Leyland vehicle systems. This part is also compatible with high-standard braking configurations found in King Long and Yutong models, ensuring seamless integration into existing pneumatic circuits.

Workshop technicians should note the specific port dimensions and pressure thresholds during installation to ensure optimal function. The unit features Port 1 at M22x1,5 and four M16x1,5 ports (21 through 24). It is engineered to operate with opening pressures of 6,9 BAR for ports 21/22 and 7,2 BAR for ports 23/24, with a consistent closing pressure of 5 BAR across all outlets.

Regular inspection of the valve connections and pressure thresholds is recommended to prevent system failures in heavy commercial vehicle fleets. This component serves as a robust replacement for maintaining strict braking safety standards in transit environments.