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Part Number: S-4771 (often listed with replacements from Bendix such as 286171 / BX286171 / KN-22140).
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Type: Brake Valve (dual circuit) — it controls and distributes brake pressure between circuits.
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Ports: Typically has multiple supply and delivery ports — e.g., four 3/8″ NPT supply and delivery ports — so it can manage pressure to different brake circuits (front/rear/redundant systems).
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Replacement For: Common Bendix valves like E-6™ style brake valves (used widely in heavy vehicles)
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