So, I've got a bit of an issue that I was hoping some of the car guys here could help me with. Awhile ago, my left rear brake caliper started sticking. At first I didn't know what it was, but I first noticed it right after I got my car serviced - There was a pretty strong burning smell, and I figured they must have just spilled some oil on something hot in the engine. The next time I noticed it, I also noticed my car was handling kinda sluggishly, so I got out to check and see if I maybe had a flat tire, and a fine wisp of smoke was coming from one of the wheels. The whole rim was hot to the touch, and the rotor was hot enough to feel from several inches away, so I immediately stopped driving and called my uncle. He came in, and we took the wheel off and got a look at it - The pads were scorched, but the hinge pins were fine - I did some reading and found out that could be a problem. He said it was probably just a rust ring on the cylinder, so we sprayed a little penetrating oil around the cylinder, got a C-clamp and compressed the cylinder then pumped the brakes to push it out a few times. After we had worked it in and out a bit, we put brand new brake pads on both rear wheels, and called it a day. A quick run around the block showed everything felt fine, and the wheel was dragging a little, but it was a lot better. I get back from a brief (5 mile) errand today, and my tire is hot again and I can still smell a little bit of burning. I really don't wanna shell out $200+ to get all new calipers on both rear wheels. Is there anything else I can try to maybe fix this?