Wow, I haven't been on here in awhile! Come back for a few and see all sorts of the old guys! Hope all is well! momo.75 I'm still waiting to do that cluster LED job!
4th gen calipers "freeze" stick all the time. I have swapped rear calipers atleast 5 times over the years. you have two options.
1. Get lifetime calipers from an auto parts store and plan to change a couple times.
2. buy 5th gen calipers/rotors and pads, do the swap and be good to go.