Yes, it's probable you will be required to go through the air brake test again, with a trailer.
Not sure about your other question. Call your State DMV to find this out.
The state agency that handles everything related to your driver's licences, including testing, issuance, transfers, and revocation.
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I have CDL B with airbrakes upgrading to A. Am i going to perform airbrake test again? such as 1.Applied Pressure Test 2.Warning Light and Buzzer 3.Tractor/Trailer Protection Valve Pop Out? or just we will just do skill test and road test?
And what will happen to my CDL B when i fail to upgrade it? will i lose it?
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles: