303.02.0111 4-circuit protection valve — SCANIA

This heavy-duty 4-circuit protection valve plays a critical role in maintaining pneumatic pressure stability within the braking system of heavy commercial vehicles. It ensures that the air supply is distributed correctly across multiple circuits, providing essential safety and reliability during operation. Built with high-strength components, it is designed to withstand the demanding environments of the heavy vehicle sector.

303.02.0111 is the OE-equivalent of the SCANIA 1356635 4-circuit protection valve used in SCANIA and DAF heavy commercial vehicles. This component is also fully compatible with DAF 1505399 and WABCO 934 702 387 0 systems. It ensures precise pressure regulation across various ports to maintain optimal braking performance.

For workshop technicians performing routine maintenance or system repairs, this valve offers precise opening and closing pressures: Opening pressures are set at 6,5 BAR for ports 21, 22, and 24, while port 23 operates at a higher threshold of 7,5 BAR. All closing pressures are standardized at 4,5 BAR to ensure predictable system behavior during pressure drops.

Regular inspection of the port connections and pressure thresholds is recommended to ensure the integrity of the pneumatic circuit. This part is essential for maintaining the air brake system's responsiveness and preventing unintended pressure losses in heavy-duty truck applications.