I am rebuilding my 240 Z calipers (yes I know about the Toyota 4x4 conversion but not ready at this time) and would like to know if they can be honed or just cleaned up with emery cloth. Or does anyone know of a good reference on the web?

I've had good luck with mine by simply using some very fine emery cloth as long as the pistons and sleeves aren't too badly pitted or rusted. Try to run the emery cloth around the walls and not up and down. As long as the rubbers can keep a good seal, you will be fine. The $12 rebuild kits from VB work great. Take your time and do a good inspection first.

I don't know of a good site, sorry.