There is no air brake endorsement. If you're applying for a CDL, you would need to both take the written test and do your road test in a vehicle which is equipped with air brakes. Otherwise, you would receive an "L" restriction, barring you from operating CMVs with air brakes.
If the vehicle you're operating does not require a CDL, then you don't need any special permission to use air brakes. It makes no sense, I know, but that's just how it is.
No. Such an endorsement does not exist for US licenses.
So long as the weight rating of the vehicle doesn't exceed 26k, yes, with two exceptions - you would need a Class C (minimum) CDL with hazmat endorsement if the vehicle is transporting a quantity of hazardous materials which requires placards to be displayed, and you would need a Class C (minimum) CDL with passenger endorsement if it is a bus designed to transport more than 15 passengers (including the driver).
Only if it's either designed to transport more than 15 persons (including the driver), or else carrying a quantity of hazardous materials which requires the display of placards under the FMCSR. In both instances, you would need at least a Class C CDL without an air brake restriction (there is no actual air brake endorsement), as well as a passenger endorsement (for a passenger bus) or hazardous materials endorsement.
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.
Yes, so long as it doesn't transport hazardous materials, or isn't a bus designed to transport more than 15 persons (including the driver).
Air brakes don't matter insofar as license classes go. If it's a bus designed to transport more than 15 persons (including the driver), you'd need a Class C CDL with passenger endorsement (school bus endorsement if it's a school bus). If it's a vehicle carrying a quantity of hazardous materials which requires placards to be displayed, you'd need a Class C CDL with a hazmat endorsement. Otherwise, an ordinary driver's license (the class varies by state).
To answer you we need to know what country's traffic regulations you are asking about.
If it's a bus designed to transport more than 15 persons (including the driver), it requires a CDL appropriate to the weight rating of the vehicle with a P (Passenger) endorsement. For a school bus, the passenger endorsement must first be obtained, then a background check must be completed for the "S" - school bus - endorsement. If it's a vehicle transporting any quantity of hazardous materials which requires the placards to be displayed (in accordance with CFR49), then the vehicle requires a CDL with a H (Hazardous Materials) endorsement. If it's a tanker vehicle hauling hazmat, the X endorsement must be held (X is a combination of "H" - hazmat - and "N" - tanker... some states show these endorsements separately, but North Carolina combines them into the X endorsement, although, IIRC, you still pay for two endorsements). For a vehicle with a Gross Vehicle Weight Rating of 26,000 lbs. or less which requires a CDL under the conditions described above, there is the Class C CDL. Likewise, a holder of a Class B or Class A could operate such a vehicle, provided they held the endorsements. These laws do not vary between states - CDLs are federally regulated, and those regulations blanket all US states and territories.
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).
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.
No, unless you're hauling something which requires a hazmat endorsement, such as contaminated soil.
26000 increased by 30 percent =33800=26000 + (30% * 26000 )=26000 + (0.3 * 26000 )=26000 + 7800= 33800