If you buy a replacement caliper instead of rebuilding --
Due to differences in wear and age, the mismatched new and old calipers will not be excerting equal braking pressures on the discs. The new one will function better than the old, and problems can arise. You should always buy calipers in sets of two, left and right.
Likewise, if you rebuild one, you might as well rebuild the other, too ... especially since the car will be down and out of brake fluid anyway.
My $.02
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