This is a LONG video.

You will see a full rebuild of the rear brakes. I will show you how the rear calipers work and how to rebuild them.
I did not change the pistons but these are available and doesn't cost much.

Some may have other ways of doing this but this is my way and it worked.

I will try to find a better place for the microphone so that it won't record all of my heavy breathing :)