Brakes hanging in the rear

Hello, Slowly we don’t know any more with our Toyota Avensis T27 bj. 2009 113000km running power. After the brake caliper on the rear right (passenger side) has given up the spirit and we have replaced it with new ones. If the brake disc gets really hot (hotter than all the others). Brake fluid was replaced immediately. After 1000km again brake caliper changed (was suspected of defect in the brake caliper). Problem remained. Brake fluid changed again and there came dark Bre Then both rear brake calipers of NB Parts were replaced before by Bosch and brake discs/brake pads. Now the two rear discs are getting hot. Brakes were also reset with computer. Does an idea have to be taken into account? Can there also be a problem from the electric brake? Addendum: You can also notice with rear tires when turning that they hang something.