Hello MX5 municipality Wanted to change the brake pads at the MX5 of my acquaintances. As is well known, the piston is turned back at the rear caliper with a 4-ring all-in wrench. Or let’s say, by turning the screw on the left the piston should come back. Unfortunately nothing happened at all. The screw can be rotated super easily and also seems to sit loosely in the bore, but nothing happens. Is the screw in the caliper possibly broken? What would a spare brake caliper kos The vehicle is a MX5 NA, year 95, 90hp Franconian hard!