The presence or absence of air brakes in a vehicle has no effect of whether or not it requires a CDL.
Air brakes aren't even a factor in determining whether or not a vehicle requires a CDL.
Air brakes have absolutely NO effect on whether a vehicle requires a CDL or not.
Air brakes have absolutely ZERO determination in whether or not a vehicle requires a CDL.
Yes
You don't need a CDL to operate a vehicle with air brakes if the vehicle doesn't fall within the requirements to mandate a CDL licenced driver to operate it. For example, RVs often have air brakes, as do many of the trucks manufactured for companies like FedEx, UPS, Merita Bread, etc.
Air brakes have absolutely no determination on whether or not a vehicle requires a CDL. Zip. Zilch. Nada. Not just in Maryland, but in any state.
The presence or absence of air brakes has no impact on whether or not that vehicle requires a CDL.
Air brakes have absolutely nothing to do with determining whether or not a vehicle requires a CDL.
The braking system doesn't determine whether or not a vehicle requires a CDL.
In the US, unless you have a Commercial Drivers Licence (CDL), you don't need any additional endorsements to operate a non-commercial vehicle with air brakes. If you're going for a CDL, then you need to take and pass the written test for air brakes, as well as road test on a vehicle equipped with air brakes.
You need a valid drivers license. Air brakes don't affect what type of license you need.
No. Air brakes don't determine whether or not a CDL is required for a vehicle, and CDLs are for road vehicles - a trolley is a rail vehicle.