Rebuild kit is $4. Rebuilding them is simple. Remove the caliper and pop the piston out by either grabbing it with a pliers, or using compressed air in the brake line. Remove the old dust boot and o ring. Clean everything up really good, reinstall dust boot and o ring, reinsall piston, and your done. 15 minutes of work at the most.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride