06 bently brakes
Well im not sure if this will help but i know alot of the newer luxury cars have computer controlled braking that means to release pressure on the calipers you have to have a OBD Tool to open the valves.
Computer controlled braking or not, brake hydraulics are not pressurized while the vehicle is not in motion. You should be using a caliper piston compression tool. If that is not available, a large c-clamp will work if you use care. IF THE PISTON HAS TWO DIMPLES OR HOLES ACROSS FROM EACH OTHER IN THE PAD-FACING SURFACE RATHER THAN BEING SOLID OR HOLLOW, STOP! This piston must be rotated and pushed in at the same time, which requires a more specialized tool.