2 Piston Vs. 4 Piston MTB Brakes - What's the Difference? | TBS Bike Parts
Shimano XT BR-M8100 2-Piston Front & Rear Disc Brake Set | Bikecomponents.ca
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