Air dyer update and additional help please (outcome)

Thanks for the kind words. When I got my bus, I was very intimidated by the air brake system. In Ontario, where I lived, I had to take a commercial air brake course and get a full tilt commercial air brake license condition. I took that starting point and kind of ran with it - my bus is a 1980 MCI and uses a different type of air brake than current models, and I needed to fully understand it and how to test it, and repair it. It's taken a few years but I think I'm getting the hang of it now!

Brian