Mark,
The attached link is to the Bendix Air Brake Handbook. When I first got into the trucking industry, because I knew all about cars, I felt truck stuff would just be bigger...........WRONG!
This Bendix book became my bible. Lots of pictures & all air systems are covered !!!!!!!!!
http://www.luxurycoachlifestyle.com/forum/manuals-datasheets/5056-bendix-air-brake-handbook.html#post32145