These are better off bought new. Ive bought a few 2nd hand over the years and without fail, they've been as shit as the one on my actual bike. Thats why they're 'lying around'. They're not hugely expensive, but knowing how much of a pain in the arse these are; its easier if they're new. Plus bleed it with the whole thing off with the bleed nipple at the highest point. You may be lucky and do it 1st time in-situ but Ive never been that lucky over the years. I swear they have their own belligerent minds.
