303.02.0104 Protection Valve 4-Circuit for MAN

This 4-circuit protection valve is a critical component within the pneumatic brake system of heavy commercial vehicles. It functions by distributing supply pressure to four independent circuits, which typically include the front brake, rear brake, spring brake, and trailer supply lines. By providing precise pressure management, the valve ensures that a pressure loss in one circuit does not compromise the entire braking capability of the vehicle. Designed for high-reliability operation, this component is compatible with MAN and Neoplan vehicles. It integrates seamlessly into the air processing assembly, connecting the air compressor output to the main brake control unit. The unit utilizes high-strength components to maintain structural integrity under constant pneumatic fluctuations.

The technical configuration includes M22x1.5 Voss ports for secure connections across all four channels. For optimal performance, technicians should verify that opening pressures are calibrated between 6.9 BAR and 7 BAR, while closing pressures maintain a consistent 5 BAR threshold. Regular inspection of the ports and connection seals is recommended during routine maintenance intervals to prevent air leaks.

This part is an equivalent solution for those seeking reliable replacements for WABCO systems. Ensure correct installation by checking all pneumatic lines for debris before assembly to maintain system integrity.

OE cross-reference

303.02.0104 (4-circuit protection valve) is the equivalent of the MAN, Neoplan and WABCO OE numbers. This part directly replaces MAN OE number 81521516098. It also replaces Neoplan OE number 8151516095 and WABCO OE number 9347144000.