I got my new 120 calipers due to stuck lower pistons, got the rebuild kit so I’ll keep the olds as spares. One thing I did notice was, both on the 120 and the 95 ones I also changed, that quite a bit of dirty fluid came out. On the 95 it had had a recent fluid change, but that didn’t seem to have cleared the murky stuff (mix of dirty fluid and water I think) at the bottom of the caliper, same on the 120. A bit of extra hassle, but the next time I change the pads, I might take the calipers off and give them a good flush through.