Hello and Season's Greetings to all. I just joined today, and I did so because I was also looking for an answer to this question. I can't post a link to the CA DMV CDL handbook, but in this last year's version (2014 - 2015), you can find a separate chapter on Air Brakes (Chapter 5). Right at the top section, it defines the three components of an air brake system, then it goes further to say that this system will have two things.. a gauge system and a low pressure warning system. Then, it goes on.. I quote the manual:
"If the vehicle you use for your driving test does not have these components, your vehicle will not be considered as having an air brake system and you will have a “No Air Brakes” restriction on your CDL"
I think this is the definitive answer and should settle any questions. It seems that there is no special endorsement for air brakes, but if you show up for your California CDL test in a truck without air brakes, that your license will have the above mentioned restriction ON the license "No Air Brakes". If you wanted to get this restriction lifted, you'd have to re-test in a vehicle WITH air brakes, and you'd have to show proficiency and knowledge about your truck's air brake system.
I've been doing a lot of research on these things, because my husband and I bought a '96 IH 4700 one year ago, and I just found out about the "soot filter" requirements and otherwise the need to file for a 1,000 mile exemption from ARB (CARB). The truck is pretty much up to me, now, because my husband had a stroke about 3 / 4 mos after we bought the truck. Our plan was to use it to help us move out of state. Tricky, but I've managed to figure out a way around all the obstacles which threatened to stop us, before we got started. I've driven the truck (6 speed manual) and I love that truck! All the jitters are gone after two trips out on local streets and learning to shift it properly, etc. Wild horses couldn't tear me away from it, and I've already done some small repairs to the electrical (broken lights, bypassed fuses for auxiliary use, etc).
But, there are a lot of things.. legal things.. to know and a pretty steep learning curve for a beginner. My best advice for those seeking answers about state laws is to go online and download their CDL Handbook. That's where you will get really accurate answers.
As for Jay Leno's rig, I think the nature of the game now is to get as much truck as you can while staying within the limitations. Most non-commercial owners who want a big truck are going to want it to haul their toys, and it's not a bad idea to go for the air brake option, if available, but there is no restriction for people using a truck with air brakes if they have a C license (most common type).
Most states are not going to have as many rules and restrictions as California. Long story, but the Federal agencies which typically provide the framework for administrative rules only require a minimum compliance per state to qualify for Federal grants to state agencies. But, the Feds most likely will have language in the Federal law to say that states are able to write their own laws which EXCEED the Federal requirements. There is probably no tougher state in the Union to know and comply with all of it's laws than California. I would suggest that if you plan to go through CA, that you take a current copy of their CDL handbook, just in case you have to show the inspector or Chippie where you think you know your rights (being polite, of course!)