German Magura Hydro Stop Rim Brakes
I have the mounts to fit disc brakes on the frame and fork , (& now Hubs , too)
(In fact the year previously ('03) the company supplied the version of The World Tour,Rohloff, Bikes built up that way)
the HS 33 that came on a 04 bike I got Used in 08 .. after I Finished the Hose replacement to reach the new Higher handle bar Height I wanted, ... after stem raiser addition..
have been thru 3 sets of KS brake pads & I've never needed to do anything with the fluid ..
Significant is the difference between their Closed system , and the expansion tank
with its sealing Bladder that is required for Hydro Discs because of the normal disc/pad friction heating the fluid..