[Phil]

Ian
I would echo what Bob said and add that bleeder location might be an issue, although most performance calipers have more than one bleeder. They seem to be easiest when the caliper is vertical with the bleeder on top.
I once worked on a GTD where the calipers were on the bottom, and we had to dismount the caliper, slide it around to the top, bleed it, and re-install, all the while fighting with limited flex line length. This was on the rear upright.
Cheers
Phil