Front brakes sticking

I have a 1994 E-150 240,000 (and going strong). My front wheels were getting very hot. A friend told me my brakes were draging. The drivers side seemed to be the worse of the two, so I replaced the caliper, brake hose and repacked the wheel bearing. I also replaced the master cylinder. I bled all the wheels and took it for a test ride and the front brakes started to stick again. Felt like I was pulling a cement truck. Then right before I pulled in my driveway, it went away again. I dont want to replace stuff on the passengers side yet cause it didnt seem to help on the drivers side. Being that it was happening to both wheels, I really was leaning towards the mas. Cyl. Being the problem- but appearently not. Any ideas you might have on this would be greatly appreciated. (By the way, both wheels were hot again after the test ride)