DIY - 2014 Kia Sportage 2.0 CRDI: Diagnose and rebuild (repair) a dragging rear brake caliper

A few days after changing the rear rotors and pads, I noticed a temperature difference of 20 - 40 deg. C between the rear rotors. I investigated the issue and found the rear left caliper piston to be dragging due to rust from a pinched dust seal. After rebuilding the caliper with OE parts, the problem was gone and the car returned a nearly 10 % improvement in fuel consumption.
OE part codes:
- Caliper piston: 582351H000
- Caliper inner seal: 582321H300
- Caliper outer seal (dust seal): 582331H000
- Crush washers for the brake line banjo bolt (2 pcs): 1751210000

Disclaimer: This video was made in the hope that it will be useful to other DYI-ers that work on the same vehicle model. The author of the video is not responsible for any kind of personal injury, property damage etc. that may arise if anybody tries to perform the same job on an identical or otherwise similar vehicle based on the contents of the video. Every DIY operation performed on your vehicle poses direct or indirect safety risks to you and those around you. Before attempting any such DIY job, please make sure that you have all the necessary tools, support and confidence to see it through successfully.