The 4 pistons are notorious for leaking. However, you can get the 4 pistons redone with SS sleeves. Did it on an older corvette with no issues. I would keep it original.
Ok, cool. Unfortunately looks like the front left caliper has a hairline crack, and probably have to get a replacement. Looks like price varies quite a bit. Anyone know of a brand to stay away from, or recommend a good value caliper?