Rear brake job - inside the rear caliper on a vw audi parking brake and adjustment

[carapungo]

in addition, I did not realize i had to turn the piston clockwise to get the piston in, so that i can put the pads, so instead, I hit the piston with a hammer. Did I damaged the caliper, by doing this?, should i put in a new caliper?, finally, the car is making a knocking noise when i started, and as sson as I hit the brake pedal, it goes away, is this related to the brake mechanism somehow?

thanks

[carapungo]

I have a 96 audi A6 quattro, and it has the same mechanism you show on this video, that is it has the self adjuster, but mine doesn't come out like yours, i can unscrew the piston all the way out with no problems. I did not try to unscrew the self adjuster, can i do this on my audi 1996 A6 quattro, in addition, what is the correct positioning of the piston when you screw it back in?, do i do it until it stops?

thanks