Amazon.com: SHIMANO Deore XT BL-M8100/BR-M8120 Disc Brake and Lever - Front, Hydraulic, Post Mount, 4-Piston, Finned Metal Pads, Black : Sports & Outdoors
Shimano's Deore XT M8020 4-piston disc brake is here! Plus, confirmed weights & UK pricing - Singletrack World Magazine
Étrier de frein à disque hydraulique à 4 pistons SHIMANO DEORE XT | SHIMANO BIKE-FRANCE
Shimano XT gets 4 pot brakes again & shorter separate crankarms - Bikerumor