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1980 u model air valves



While in the process of replacing the wiring harness, I removed Three air brake valves from the dash.   I thought I marked them well, air line placement and so forth; however, ( and this is a tip for others) the paper and ink I used was not water-resistant and i now cant tell well most of the lines go.  I have it figured out for the most part as the trailer brake valve and pressure switch is marked differently, but currently there is an open hole that air streams through.  So it's obvious I'm missing something.  MOst of the info I've found only refers to two valves in the dash.  Any help, schematics, drawings pictures-  the service manual isn't giving me much guidance either?  I'm scratching my head.

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