If it came with disc brakes in the 1st place you can upgrade to hydraulics , from Mechanical discs.
OTOH, If it came with V-rim brakes , the hydraulic upgrade is Magura's HS 33. still a rim brake.
http://www.magura.com/en/bicyclecomp...s/hs-33-2.html
http://old.magura.com/en/products/ri.../hs-33-53.html
Last edited by fietsbob; 12-12-13 at 01:38 PM.