303.02.0075 KNORR-BREMSE 4-circuit protection valve

The technical function of this 4-circuit protection valve is to manage and distribute pneumatic pressure across multiple circuits within the braking system, ensuring safety and stability. Built with heavy-duty grade materials, it provides reliable pressure regulation under demanding operational conditions in the brake system.

303.02.0075 is the OE-equivalent of the KNORR-BREMSE AE 4171 4-circuit protection valve used in heavy commercial vehicle braking systems. This component features a specific configuration including Port 1 (M22x1,5) and four secondary ports (M16x1,5) to maintain precise opening pressures of 7,9 BAR and closing pressures of 6,4 BAR for optimal performance.

For workshop technicians performing maintenance or repairs, this part offers seamless assembly and compatibility with existing pneumatic architectures. It is essential for maintaining the integrity of the air brake system by preventing pressure loss across different circuits. Regular inspection of port seals and pressure thresholds is recommended during routine service intervals to ensure long-term reliability.

Proper installation ensures that the pneumatic circuit remains stable during high-pressure transitions. This component is specifically engineered to meet the rigorous demands of the heavy commercial vehicle sector, providing a robust solution for fleet managers and service professionals seeking high-quality replacement parts.