Do you need a cdl to drive an air brake vehicle that is under 26000 lbs?

It depends on the state or country in question, as regulations may vary. In the United States, for example, a commercial driver's license (CDL) is generally required to operate a vehicle with an air brake system, regardless of its weight. However, there may be exceptions for certain vehicles or specific situations, such as farm vehicles or recreational vehicles. It's always best to consult the relevant regulations or contact the local Department of Motor Vehicles (DMV) to obtain accurate information about CDL requirements.