TRP HY/RD disc brake calipers bring the stopping power and added control of a hydraulic disc brake system, without the added expense of replacing your dual control shifter/brake levers. 
TRP HY/RD brakes are designed to be used with and are compatible with all short pull brake levers. 
HY/RD brakes will not work with long pull mountain style levers.
The advantages of a hydraulic system over a traditional mechanical disc brake are the fact that they "pinch" the rotor from both brake pads vs "pushing" the outboard pads into the inboard pads,  hydraulic brakes are also self-adjusting to make up for pad wear. 
The included disc brake pads with the 
TRP HY/RD are made from a resin compound with metal fibers and are compatible will all rotors, including rotors that are labeled as resin pad only.
To make installation and servicing your TRP HY/RD disc brakes easier, TRP has produced a series of video available 
here- Hydraulic disc brake system compatible with all short pull brake levers.
 - Integrated caliper side master cylinder
 - Includes resin pads with metal fibers
 - System weight 195g
 
TRP HY/RD disc brakes bring powerful and reliable stopping power of a hydraulic disc brake to road drivetrains with the need to buy new costly shifters.