No. Air brakes are not a parameter in determining whether or not a vehicle needs a CDL.
Air brakes have absolutely ZERO determination in whether or not a vehicle requires a CDL.
There's no such thing as an air brake endorsement on any US license - only a restriction for CDL holders which bars them from operating a vehicle requiring a CDL which is equipped with air brakes if they don't pass the written air brakes test and perform their pretrip and road tests in a CMV which is equipped with air brakes.
There is no such thing as an air brake endorsement on a US license - only a restriction for CDL holders who do not pass the written air brakes test and perform their pretrip and road tests in a CMV which is equipped with air brakes.
If the vehicle is for commercial/business use, or otherwise does not fall into an exempted category with the FMCSR which makes it not require a CDL (and is operated within the conditions which must be met for that exemption to be applicable), then that vehicle requires a CDL. If it is equipped with air brakes, and requires a CDL, then the driver must have completed and passed the written air brakes test, and must have performed their pretrip and road tests in a CDL vehicle equipped with air brakes. Otherwise, they get a restriction which bars them from operating a vehicle which requires a CDL and is equipped with air brakes. If the vehicle does not require a CDL, then no endorsement for air brakes is needed - air brake endorsements do not exist on US licenses; only the aforementioned restriction for CDL holders.
Only if it's a vehicle equipped with air brakes.
No
I would hope not, seeing as you can't get one. There is no such thing as an air brake endorsement on a US license. Go ahead.. read your state's driver license manual and the CDL manual - you'll never see "air brake endorsement" anywhere in there. Now, for people with a CDL, there is an air brake restriction. If they don't pass the written air brakes test and complete their pretrip and road tests in the appropriate category of vehicle equipped with air brakes, then they'll get the 'no air brakes' restriction, which prohibits them from operating a vehicle requiring a CDL if it is equipped with air brakes. The only times a vehicle under 26k GVW requires a CDL is if it's either hauling hazmat or a bus designed to transport more than 15 persons (this number includes the driver).
A vehicle having air, air-over-hydraulic, or hydraulic brakes does not affect whether it requires a CDL or not. The only cases in which a CDL would be required for a vehicle under 26,001 lbs. GVWR is when it's either a bus designed to transport more than 15 persons (including the driver) or a vehicle carrying quantities of hazardous materials which require the display of hazmat placards.
Air brakes are not a factor in determining whether or not a vehicle requires a CDL, in any state or territory of the US, period. The only instances when such a vehicle as you describe would require a CDL would be in the case of hazmat haulers and buses designed to transport more than 15 persons (including the driver).
In the US, no - there is no such thing as an air brake endorsement - only a restriction for CDL holders who don't pass the written air brakes test and complete the pretrip and road tests in a vehicle equipped with air brakes, which prohibits them from operating vehicles requiring a CDL which are equipped with air brakes.
Only in cases where the vehicle fits the criteria where it requires a Class C CDL. Examples would include vehicles designed to carry more than 15 passengers (including the driver), and vehicles carrying hazardous materials in a quantity sufficient to require placards to be displayed. If a vehicle under 26,000 lbs. does not meet the criteria where it requires a CDL, then it can be driven on a regular Class C licence, whether it has air or hydraulic brakes, without any additional testing.
The air brakes don't matter, insofar as whether or not a CDL is required. As for the GVW being over 26,000 lbs., yes, unless your vehicle falls in criteria for the farm vehicle, military vehicle, emergency vehicle, or recreational vehicle exemptions.