Shimano Deore XT BL-M8100/BR-M8120 Disc Brake and Lever - Rear, Hydraulic, Post Mount, 4-Piston, Finned Metal Pads, Black

The Shimano Deore XT BL-M8100/BR-M8120 Rear Disc Brake is a unisex mountain bike hydraulic disc brake made for trail and enduro bikes that need powerful four-piston braking at the rear. The BL-M8100 lever uses Servo Wave action and tool-free reach adjustment, while the BR-M8120 four-piston caliper spreads braking force across four pistons for controlled power on steeper terrain. Finned metal pads help manage heat on long descents, and Shimano mineral oil keeps service consistent with the rest of the current XT brake family. Verify rotor size, adapter, and hose length before installation. It is intended as a straightforward, serviceable component that fits naturally into a well-sorted setup, with compatibility and installation details worth confirming before use.