Well I finally got it in the shop today. Had the rotor, pads, caliper on the right side replaced. The mechanic could not find any kinks, leaks, or anything of the like the could be the culprit for my problem. Someone finally suggested that it might be the master cylinder. What do y'all think? Does that sound like a possible culprit here? I'm wondering why no one has mentioned that until now. I was also told that I might have this recurring problem because I'm replacing the calipers with aftermarket ones which are made differently...thoughts?
On the same topic, should I go ahead and replace the pads on the left-rear since I just did the right rear? They're not wore down like the left side was (caliper not frozen), but I think it might be a good idea so that they'll be the same thickness.