I have some Hope hydraulic disk brakes. In the last week or so i've noticed a black oil on the disk (an it squeeks like crazy).
I've been told its probably the seals that have gone. Im not sure what model they are but i've bin looking on the net for seal kits (at www.chainreactioncycles.com) and have found a couple of sets at a third of the price my LBS charges.
Theres: closed2 and open2. I know that my brakes are two piston so i assume it will be one of these??

How do i work out which one??

Also how hard a job is it to change them (im told its easy, its re-filling the brakes thats the hard part!)??