[Tyler Durdan]

When I bought my 300zx calipers from the junkyard, I ended up rebuilding/resealing them for creature benefits. If I was you, I would just do a rebuild them....$40.00 bucks to be spent on a stb or two lap dances .
It's a pretty simple job, but be careful when pulling the piston, and reinstalling the piston...any scratches on the inside of the piston or cylinder can cause a real problem. Use an air compressor hooked up to the brake hardlines, and slowly up the pressure on the air compressor to "pop" the piston out of the cylinder. Use a steel wool cloth to gently remove any gunk on the insides. Replace lubricated seals, reinstall piston, install caliper, and bleed the brakes to hell and back. Simple and straight foward.

P.M. me if you need more specific instructions...this is just the basic run down.