Hi Guys, another can of worms opened. I didn't split last time as I agree with Rob, leave well alone if all is working however fitting the dustcaps was a real mission hence the water ingress. My O-Ring kits came with the O-Rings for joining the two calliper halves so I reckoned to try splitting this time. Upgrading the front brakes on my Capri based kit car to vented discs required fitting a sandwich plate between the two halves of the callipers, worked first time without any drama so far as I recall. Any other opinions on this one?