Since you are posting in the AVL section, I assume you have an Electra. These have a disc brake. There is no adjustment. If the brake is sticking you have a safety problem that must be addressed NOW! Sometimes the lever pivot gets gummy. Take off the lever, clean the pivot pin and the hole in the lever it goes through, lightly grease the pin and reassemble. If this does not fix the issue you have a caliper and/or master cylinder problem. You must take this to someone familiar with hydraulic brake systems for repair. It will involve dis-assembly of the system for cleaning. Depending on the extent of the repair you are looking at about 1 to 2 hours of shop labor.