Piston provision

hello CR-V community, actually come from another forum and have already used your search, but unfortunately didn’t find it revealing……sniff, now to my problem….. my nice father-in-law drives a CR-V 2,2-diesel year 2007 where the brake is totally down in the back….because I’ve already changed several brakes in my life-just vw,opel,bmw-he came up with the idea that I could possibly do it……grrrrrrrrr that he has an inside drum for the handbrake “Have I already seen wear-warning contact apparently not!!! how do I set the brake piston back??? to the right turn and press at the same time as with the VAG models??? or just press??? special tool necessary??? should the jaws for the parking brake be replaced immediately??? the car now has 128000km down….have also seen a kind of slot screw from outside at the disc brake-can you probably turn out to adjust the brake cheeks of the drum-meat I want to remember something else????? thank you so much for your quick help