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When I was repairing my CTIS, I had several controllers. Some of them had some very strange errors. I found a good one and it has worked flawlessly. It might be a good idea to borrow a known working controller, so you don't end up chasing crazy controller issues. I unplug my controller when ever...

I bought a stack of 10 of those seals on ebay, seems they were like 167$ no freight. That is like 16,70 each. Front and rear wheels are the same number. I bought CTIS and front axle shaft seals the same way, same price. I don't want to be stranded somewhere with parts several days away.

This is the modulator valve, (also called the valve manifold), I borrowed your picture. One line is supply air pressure from the wet air tank thru the pressure protection valve, one line is controlled air pressure to your quick release valves, one line is the vent. I don't have a modulator...

One of the best things I learned while working on my CTIS is that the controller is highly sensitive to system leaks on the controlled side . The best way I found to find the leaks was to remove the line from the modulator valve assembly that goes to quick release valves that supplies air to the...