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Haldex · Air System
KN28600
In stock · ships from Knoxville
The Haldex KN28600 is a Full Function (FF2) trailer relay valve that combines a pressure protection valve, two one-way check valves, a spring brake valve with quick release, and a four-port relay valve into a single unit.
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Verified fitment for 2 applications
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All confirmed applications for this part number.
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Universal fit for air brake systems; not specific to a vehicle make or model.
Part data verified against 5 catalog sources
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It manages the flow of air to both service and spring brakes on heavy-duty trailers and tractors, giving priority to the service brakes when air reservoir pressure is low and preventing compounding of spring and service brakes. You would replace this valve when you experience air leaks, uneven braking, or if the valve fails to maintain proper air system pressure, as it is a critical FMVSS-121 compliant component in air brake systems.
Part Number: KN28600
FULL FUNCTION VALVE
Unit: ea
Dealer: Post Onsite
Compatibility, alternatives, and more
Parts commonly needed alongside air system
