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Sealco · Air System
110171
In stock · ships from Knoxville
The RT4 valve, also known as a spring brake control valve, is a multi-function air valve used on trailers to manage parking and emergency brake functions.
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Universal fit for most standard semi-trailers, converter dollies, and other towed units with protected dual-reservoir air systems. Not specific to a single truck model.
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It automatically applies the spring brakes if the trailer supply line loses pressure, controls reservoir charging, and provides a relay function for service brakes. This valve is typically replaced when the trailer fails to hold parking brakes, exhibits air leaks from the valve body, or shows improper brake application.
Part Number: 110171
RT 4 VALVE
Unit: ea
Dealer: Knox Trailers
Compatibility, alternatives, and more
Parts commonly needed alongside air system
