Many thanx folks
I have got braided lines since last month ( I thought that would be the answer) but no luck
So I guess I'll just have to keep bleeding the buggers to see if that helps. I've lost count of the times I've bled them now! Looks like I'll be investing in new seals. Last time I stripped them down to clean them, the pistons in the calipers looked like the'd been attacked with a pair of pliers. Anyone know how much replacements are?