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Rosco, you are correct as I could only see the bottom underneath, not enough clearance to see from the "top"

Dell, I did not drive/tow the trailer today but feel having hooked up the hoses "wrong" was the issue. The air was applying the brakes without using them. Once I drained the tanks and disconnected the hoses, It towed fine. The trailer was real cherry and I suspect real low miles/usage. Not sure...

Well, I finally got under the trailer. The ports under the valve are labeled "delivery" on both sides on the bottom but I could not see the top of the relay valve. The new valve is clearly marked with the Driver's side = "Emergency" & Passenger's side = "service" on the top so in this case the...

Thanks for the advise! Trailer is not at my house but I will check it out to see where the hoses are plumbed. I do have a new valve and it does have the markings cast into it quite clearly so I imagine the original one also will be marked or i will use the new one for a reference. I believe...

My trailer brakes locked up when I attempted to tow my m105a2 with the dual hoses hooked up to my m923. I had the hoses hooked up straight Left driver side to Service and right side to passenger emergency on the m923. I did have the valves open as I tested for air and had changed the glad hand...