I just did my GLI brakes last week end, fun! haha. So easy once you have done it once.
You are clamping the piston, while trying to turn right? Needs to have pressure to get it to go in.. I am sorry if this is all obvious to you... it was my first brake job. I had to clamp, turn, clamp tighter, turn, tighter, turn...
Do you have the brake reservoir cap off and emerg/parking brake disengaged (with wheels blocked)? I am not sure if the cap needs to be off to do the job, but it was suggested to me and it all went well.
HTH, but onemoremile's suggestion is likely closer than my thought.
B.
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