Magura, MT7 HCW, MTB Hydraulic Disc Brake, Front or Rear, Post mount, Disc: Not included, Black - Walmart.com
Amazon.com : RUJOI Bike Disc Brake Kit, Aluminum Front and Rear Caliper, Full Aluminum Alloy Bicycle Brake Lever, 160mm Rotor, Mechanic Tool-Free Pad Adjuster for Road Bike, Mountain Bike (140mm Disc Brake