Hello! I haven't done any research but I don't think calipers are supposed to move with the trailing arms.
Making it as separate brake object would be better.
I don't see a problem with the front strut thought.
EDIT: A better solution could be separating the strut as mudguard object and the caliper as brake object.
Using "mudguard" for the front strut could be the technically correct method, thanks for the tip, but I can't see any real advantages. (the only thing that bothers me with the current state is how ugly it looks when driving from wheel camera, sadly mudguards are visible there too)