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looks like part of the casting to me. With calipers the two critical areas are the bore and the piston, so long as they are corrosion free, not pitted or scored, they should work. Next in line is the passages which can be blocked by crystallized brake fluid.

what caliper is it? For what bike? Obviously information is not your strong suit....
 

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almost all aluminum calipers have a steel liner, otherwise rust would not be as big an issue. The fluid you pulled out sounds like it just had water in it and had begun to dry out which is not uncommon (when it has water in it it get murky when it begins to dry out it crystallizes becoming like molasses before becoming crystals).

If that circle at the bottom is hard metal then it is casting. I don't know where you get this idea about disintegrating metal in a caliper they just don't work that way. One hole pushes fluid in, the piston slides in the cylinder. When the pressure is released one hole lets the fluid out and the piston retracts. There really isn't anything going on behind the piston besides fluid pushing it out and then itself getting pushed back into the MC.

for the record brakes should be services every 2 years. If not there is potential for fluid to go bad and ruin the inside of the caliper.
 
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