Trikes can have disc brakes, or perhaps drum brakes which can be part of the design. But the manufacturer has to pay attention to the design. Some of the uprights also have coaster brakes.

Delta trikes can put the discs on the axle in the middle, or at the wheel.

A great number of trikes only drive off of a single wheel, whether it is a dual rear wheel or a single rear wheel. It can be an issue for riding on gravel.