Hello, yesterday came up with the following problem: the outer brake lining on the rear right no longer has any lining on it, there is already metal sanding on metal. The brake disc has already Riefen outside. On the left rear wheel, however, there is still a good 4mm lining on it. Can’t actually only the brake piston go back properly anymore, right? Yesterday I drove a longer piece without braking (up and let the car roll out half way), the left brake disc was cold (i.e., i.e., only minimally), the right was lukewarm (but only minimal) Must be changed since the complete brake caliper or can you get it through cleaning again? thank you in advance Ciao, Eric