I fly a WRX wagon 2006
I was changing rims the other day
and noticed that the inner side of the caliper does not go back so the pad is pretty much done on that part. the outer part works as it should and the pad there is fine.
Its a 4piston caliper.
My guess was that the seal had broke and dirt came in between. Preventing the piston to roll back.
So I went to get a seal replacement kit and new pads.
Any advices / Hints before I go and do something stupid that could ruin the caliper / pistons / ?