Wait/renew the drum brake at the rear of the Manta B

After having reworked the brake at the front of my manta, I now go to the . I take apart a drum brake for the first time and would like to work with this topic on the structure and the functioning of the brake gradually. I have attached a graphic to this article, in which I marked the components of the brake. I would be happy if someone – if I had interpreted something wrong – would point that out to me. I will use grinding paper to use the brake drum. inside (system surfaces of the brake pads) free as evenly as possible from the coarse rust. Since the wheel brake cylinders can be obtained very cheaply, I would renew them precautionarily. And since the pads also do not cost the world, a change would also be useful here. Thanks in advance once again for your help.