Thank you for your comments, mark9207 and BustedKnuckles! So the caliper is likely fine. Good to hear that. I want to keep the current calipers if they are fine. I have a quick following question about piston sticking. If the piston were stuck, replacement of pads would not be possible, right? In other words, if a mechanic can replace pads without replacing the caliper, is the caliper likely okay? The brake fluid level doesn’t go down and I don’t see any fluid leaking in the wheel side, so the possible cause of the caliper replacement “suggested/requested by the shop” would be the piston.