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Fairly easy to do on most vehicles (gets funny when they have parking brakes, but this is a bike). You will need a thin piece of wood (or non metal plank), some air to pop the piston(s), a way to clean them (brake cleaner; remember asbestos warnings), and some fine emery cloth or sand paper (change paper often). The paper is to clean the bore, which will likely have a ring of crusted brown/black material. It wont take much to clean, but the new piston assembly may otherwise stick or hang. I had an old Dodge pickup that had phenolic/plastic pistons. Much better than the metal I replaced it with (chipped a piston by not using a wood block when I blew out the piston). alternative to the paper include a reamer, but these are hard to find. For iron/steel calipers (trucks and older cars) you can use a hone, but the stones will load up with aluminum.
You will also want some nitrile (better than rubber) gloves. Take the parts off of you bike before disassembling (keeps the brake fluid from your paint).
Others may have more experience with this. I wouldn't bother with the corrosion if it isn't getting inside the caliper bore, as the dust seal should stop it. Just clean and monitor. Can you get a bit of somekind of thin paint or sealer on it? The piston will only conitinue to be exposed as the pads wear, so it probably isn't necessary until the pads are replaced.
Have fun!
Mojo
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Yee-haaaaa!
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