303.02.0106 WABCO 4-circuit protection valve

This high-strength 4-circuit protection valve is a critical component within the pneumatic brake system, ensuring the stability and safety of air pressure distribution across multiple circuits. Designed for heavy-duty performance, it manages pressure fluctuations to protect the braking system from sudden drops or irregularities during operation.

The 303.02.0106 is the OE equivalent of the WABCO 9347144030 used in JAC and KING LONG heavy commercial vehicles. It features specialized port configurations including Port 1 (M22x1,5 Voss) and various circuit ports (21, 22, 23, 24) to maintain precise pneumatic thresholds. This component is essential for maintaining the integrity of the air supply in complex braking architectures.

Installation should be performed by a qualified workshop technician to ensure optimal pressure settings are met. The unit is engineered to handle specific opening pressures, such as 6.9 BAR for circuits 21 and 22, and a slightly higher threshold of 7 BAR for circuit 23, ensuring systematic responsiveness across the vehicle's pneumatic lines.

For maintenance and replacement purposes, technicians should verify the compatibility of the M22x1,5 Voss connections and ensure all port seals are intact to prevent pressure leaks in the system.