Definitely compare the new and old parts before rebuilding and decide if you could not reuse the original pistons and pins. Often the original part's surface finish is smoother and if it isn't completely rusted you can clean it with WD40 and remove potentially existent surface rust with some fine wet sand paper.

Recently I bought a pair of rebuilt rear calipers by ABS (All Brake Systems) and the sliders were complete crap. You had to overcome a rather high breakaway torque for it to start moving and you could feel the pins grinding in its guide. I replaced them with the original pins, lubed them up well and everything's nice and smooth now. The rubber seals also fit better on the original pins.

Ahh alright I'll bare that in mind, cheers guys! I'll be sure to have a good check over everything to make sure it all performs as it should!

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Scott L.