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The 900 series 5 ton tractors we had at Fort Benning may have been the first series. There may have been a MWO done on them later to update them. I don't remember there being a valve on them but that was quite a few years ago. I do remember having to hook the air lines up and open the valves by...

Really? Please post pics of yours. My M927 has a "Spring Brake Override" button but not yellow and red air supply valves like you see on a M915/916/920 or commercial vehicle. The OP was talking about an M931 which (if I remember correctly) do not have the yellow and red valves. When I drove them...

Since there are no air valves on the dash like in a commercial vehicle there are two ways you can do it. One, bleed the air off by fanning the brake pedal until the pressure drops enough for the trailer brakes to lock automatically or disconnect the air lines and the trailer brakes will lock...