TRP HY/RD Mechanical/Hydraulic Post Mount Brake: BlackTRP HY RD disc brake calipers have the power and modulation of hydraulic disc brakes. True 'plug and play' compatibility with existing cable actuated systems. Self contained hydraulic caliper incorporates master cylinder Hydraulic system self adjusts for pad wear Compatible with all mechanical road and CX brake levers Brake pad composite is Resin with Metal Fibers Resin with Metal Fibers pads are compatible with Resin Only type rotors as well as