[Fulltiming]

Rick, there are two series of video of presentations I posted on Youtube. The one Richard is referring to is Air System Fundamentals (6-part series). The first two in the series are the most apropos to the issue at hand but I would recommend the entire series. https://www.youtube.com/playlist?list=PL...LLa2eq1PbT should get you the entire playlist. The first two, Introduction and Air Brakes are listed below.

https://www.youtube.com/watch?v=7rnRcyW96m4
https://www.youtube.com/watch?v=pRS8gEyrLyM