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Eco's trailer DOES have the relay valve. You can see 2 air lines (blue and red) in the pictures he has posted. The presence of the lifting lugs is not a sure fire way to tell old "1 line" vs newer "2 line" air systems, as over the years, rebuilds and the smart thinking military mechanic has...
I dont know whats wrong with your trailer, but do this. The relay valve is in the pictures.. http://www.steelsoldiers.com/showthread.php?t=20000&highlight=m105a2+brakes Read the thread, I posted what I found and how to fix it. It may not be your problem, but it sure wont hurt anything to follow...
The relay valves go bad FREQUENTLY from lack of use... .... I wrote a post on my M105A2's brakes and it's bad relay valve.. Has the part # you'll need for a new valve... Looks like you just burnt the paint off the drums... I saw it happen a few times in the Army.. Pull the hubs, see if there...