Hi Randy,
I think it may be possible for the caliper to be at fault without having a seized piston.
A few years ago I had a dragging rear brake on a 240. One of the pistons was difficult to retract and I assumed it was in the beginning stages of a seizure.
When I split the caliper open to rebuild it, I found a snotty brown semi solid mass stuck at the junction where the fluid goes from one side of the caliper to the other. I fished the lump out with a dental pick, put the caliper back together and it's been fine ever since. The car was new to me so a double flush of the system soon followed the repair.
regards, Peter
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