1992 Pontiac Transport SE brakes stick

1992 Pontiac Transport SE mileage: 110K. The front driver side brakes stick. I replaced the calipers and brake pads, and bled the brakes. That worked for a couple weeks, but then the same brake started sticking. I recently noticed that it sticks more when the air conditioner is on. I also noticed that when they start sticking, the amps go down in the van. Are my brakes sticking because my amps go down, or are my amps going down as a result of my sticking brakes? What can I do to correct the problem? My van has ABS and I am familiar with brake systems, but I cannot figure this one out.