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Well...my next maintenance mystery is tracking down a minor air leak in the CTIS system. It has a specific behavior, so hopefully someone can give me some pointers on how best to find it. When I start the truck and it builds pressure and begins trying to air up the CTIS system, it tries once...

Hey...you guys are good. Yeah...it's the purge valve that sticks - kinda glad that's all it was. I pushed something up in there before starting it and building any air pressure and could feel it reseat. Started the truck and built pressure...things worked as they should until the valve did...

Hello all, I have an M925A2 that I've slowly been working on, and recently developed a problem and I'm hoping for some easy guidance. Long story short...I was giving it a run just to keep everything in good working shape and right as I was getting ready to shut it down I noticed I had a low...

I recently saw some surplus air dryers come up for sale with a slightly different model number - 50011P. I hadn't seen them mentioned here so I thought I'd post the information I found. From the link below - it sounds like the relief valve opens at a different pressure than the old one...

IN