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4-Circuit Protection Valve WG9000360366 for Howo/Shacman Expertise: High-precision pneumatic safety valve designed for heavy-duty Sinotruk/Howo and Shacman trucks. This valve effectively divides the air system into four independent circuits (front brakes, rear brakes, parking brake, and auxiliary systems). Its primary function is to maintain pressure in the remaining functional circuits if one fails, ensuring the vehicle can still be stopped safely. Manufactured from corrosion-resistant aluminum alloy with reinforced internal diaphragms. Service Station Experience: We recommend this genuine part because it prevents "air starvation" of the braking system. In our experience, non-original valves often have poor spring calibration, leading to uneven pressure distribution and slow brake response. This WG9000360366 model is factory-tuned to standard operating pressures, providing immediate system recovery after air loss. Mechanic's Tip: When replacing the valve, check for carbon deposits or oil in the air lines. If present, your air dryer or compressor might be failing. Always use high-quality thread sealant during installation to prevent micro-leaks. After installation, perform a leak test and verify the opening pressure of each circuit using a pressure gauge.