These brakes are on my Giant 2001 XTC NRS bike. The rear brake started to loose a significant amount of pressure, and I believe that there is a leak. I would like to rebuild the brake and replace the o-rings but I am not sure which model it is.
looks like the same business as an hfx-9, maybe a mag. See if you can grab a few identifying parts and compare. I think the barrel is a certain size on the nines vs. mags, and the piston is a little different. See if you can figure out what system its similar too, then buy your parts from there.