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Air Relay Valve WG9000360134 for Sinotruk Howo / Shacman Expertise: A high-performance pneumatic relay valve designed to accelerate the application and release of air brakes on heavy-duty trucks. It acts as a remote-controlled pressure regulator, significantly reducing the response time of the braking system by supplying air directly from the reservoir to the brake chambers. Constructed with a robust aluminum body and high-grade internal seals to withstand extreme pressure fluctuations. Service Station Experience: We recommend the WG9000360134 for its fast response time. In heavy trucks, every fraction of a second during braking is critical. Non-genuine valves often have "lag" issues or internal leaks that lead to dragging brakes. This OEM part ensures synchronized braking across all axles. Mechanic's Tip: If your brakes are slow to release, the relay valve is the first place to check. Ensure the exhaust port (breather) is not clogged with mud or ice. During installation, use a small amount of pneumatic grease on the fittings to ensure a perfect seal.