So, update incoming...
I have disassembled the right side and check the upper guide pins and yes, it had rubber sleeve on it so my guess of badly fitted pins was not right. I put it all back and moved to right side.
Removed the wheel, loosen the bolts holding caliper to guide pins, removed pads, brackets and caliper bracket with guide pins. Some brake dust was sitting in the places, where pads brackets are sitting so I cleaned with steel brush without any problem.
Then I moved to guide pins. I removed both, the grease in the bottom one was pretty dirty, even the pin had a little rust marks on it.
So I decided to put on a new guide pins, especially when the upper one has slighlty damaged that rubber sleeve. Everything was fine, the grease included in packaging of guide pins was clear silicone one, so same as ATE to fiting the brake pistons.
I lubed the rubber sleeve, fitted it on the guide pins without any problem, same with both rubber boots. Then cleaned the guide pin slots at caliper bracket with brake cleaner (nearly hit my eyes with that and old grease
). Both pins move freely, without any problem.
Then I moved to brake pads, I used 180 (or 200) sandpaper to remove paint on those "noses" I mentioned before.
I put brand new pad brackets on the caliper bracket, and lubed pads with a little bit of copper grease. The fitting was fine and pads are moving nicely and freely. The fitted caliper and brake pads are here.
I have also created video of the spinning wheel and caliper moving... [ame]https://youtu.be/iok1TBOGgJY[/ame]
First part is the movement of the caliper. As you can see, the caliper/guide pins is/are moving freely without any problem. Second part is same state, only with fitted wheel, as you can see, it can spin nicely. Third part, after I pressed the brake pedal maybe twenty times (with started engine) to pull the pistons out in order to adjust handbrake mechanism, you can see it is noticable braking
In the fourth part of video, after I pushed the handbrake leveler at caliper, it spins more freely but it is not ideal.
All in all, everything I have done so far seems to be not working :bang: The wheel heats up (there is approx 25-32°C), the right one wheel has about 40°C, the left wheel has about 60-66°C, same as brake rotors, the left one has 80-90°C (even more than front, both of them had about 70°C), the right one 60°C.
So the last step, I will do is to clean, and refurbish the old caliper (I already have rubbers, new piston etc.) and fit it back with hopes it will help. If it do not help, then the last thing I did not check is the brake hose.