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There are 6 connections on the valve block itself. I think some are going internally from one side to another, on the truck, two hoses feed each side (trailer and park) and one hose goes back down. There are a bunch of cross links on the old assembly and they have 4 connectors each.

Has anyone changed out the trailer and park break assemblies and replaced for the later style , yet? I need to know which of the lines goes where. I have been reading in the TM for M1078 and the TM for M1088 but both only show the old style manifolds not the later units. This is the unit I have...