It is a drum brake but it has a twin piston caliper, it sounds like the caliper is hanging up, i would pull it off lube it up a bit and see if that helps, the pistons may be sticking also, go ahead and check that out while you have it off, or you could replace it, thats what i did , they are fairly cheap, actually cheaper than the OEM kit, and i really didnt want to mess around rebuilding it.