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Only the parking brake would be "air over mechanical spring"... Quite right, but since all conventional brake systems end in mechanical braking, that part is dropped from the nomenclature and assumed to be there unless otherwise stated or implied such as hydraulic retarders, regenerative...

That is exactly what "over" means when it's used in this or similar context... "Over" means "activated" or "controlled". I have not seen electric over hydraulic first hand as of yet, but I am looking forward to it... I think it'll be a step forward in the landscaping to light equipment...

I havn't had a good book collection since I was at Ryder, and my UD stuff went with the last UD to go down the road. I did find this right off, it's probably better for this purpose anyhow, showing "the whole picture" instead of component repairs and trouble trees...

I believe that the use of the term "air over hydraulic" is not used correctly in the case of this particular reference manual. It's not uncommon to find both air over and air assist mislabeled in reference materials. IF this information comes from the manufacturer, then this MAY make it...

No, not at all. They're kind of (IMHO) redundant and obsolete, but they are quite legal. We used to have several trucks at work that were so equipped. Somebody somewhere may have (and should if they have not , again IMHO) stopped them from new production, but there's bunches of them out there...

You can find this described many places, and you will find many places (including technical references both old and new) where the term "air over hydraulic" is used incorrectly. Deuce brakes are hydraulic brakes as far as any governing body is concerned. More specifically, they are power...