My driver rear wheel is getting really hot, and it sounds like the caliper is sticking. Also of note, I had a really hard time spinning the piston in last brake job. I had this happen to the passenger side, which I replaced with a used caliper. I was planning on getting a refurbished caliper +/- $70 for the driver's side. Am I betting off replacing both?

 

anything you do on a corner is advisable to do to both sides (except for maybe bearings) anything breaking, steering, handling related.

 

+1 for swapping them both.

 

anything not including the pads or rotors you DO NOT need to replace both.... not unless you want to waste money and time replacing both.... your call but totaly not neccesary