303.02.0032 4-circuit protection valve — WABCO

The heavy-duty 4-circuit protection valve is engineered to regulate pneumatic pressure within complex braking systems, ensuring safety and operational stability. This component utilizes high-strength components designed to withstand rigorous industrial conditions in the heavy commercial vehicle sector. Its precise regulation of air circuits is essential for maintaining consistent braking performance across different vehicle configurations.

303.02.0032 is the OE-equivalent 4-circuit protection valve used in Mercedes-Benz, MAN, DAF, and Volvo systems, as well as being compatible with WABCO hardware. This part is engineered to meet the exact specifications of OEM codes such as Mercedes-Benz 003 431 69 06, WABCO 934 714 125 0, and MAN ZG.04645-0002, ensuring seamless integration into the vehicle's pneumatic circuit.

For workshop technicians, installation requires careful attention to the specific thread sizes: Port 1 features an M22x1,5 connection, while Ports 21 through 24 utilize M16x1,5 threads. The valve operates with an opening pressure range of 7 to 7,5 BAR and a closing pressure of 5 BAR across all circuits. Regular maintenance checks of these pneumatic connections are recommended to ensure optimal system response and prevent pressure drops during operation.

This component is vital for maintaining the integrity of the air supply in heavy-duty trucks and buses, providing a reliable fallback mechanism during pressure fluctuations.