Not too much really 4x4 escort cozzie calipers think I snipered them on ebay for about £40
the 2wd cozzie discs were £55 from the local motor factors, £25 for some brake pads from same factors.

if you look at the guide near the top section of the rs turbo section there's a detailed how to guide.

I've got another set of calipers but 1 of them has a snapped bleed nipple which I couldn't remove even after heating with oxy acet/ drilling and using snap on easy outs.

When they've bedded in they should be good, esp as the cab still had the 239mm discs on it, 283mm looks much better under the alloys too