Do you need to test on an airbrake-equipped vehicle to upgrade to a group A CDL if you already have a group B or C CDL valid for airbrake-equipped vehicles?
Answer No, because the air-braking systems are similar
The air-braking systems on combination vehicles are not that different from single vehicles. Therefore, if you already have a valid CDL for air-braking vehicles and choose to upgrade to group A, you do not have to test on a vehicle with air brakes.
Asked by Kendra Whitmire · Last updated 5 years ago · 44K views · SOURCE
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