SHIMANO A MTB / BRAKES Shimano Hydraulic Disc Brakes: Pick Your Stopping Power Deore and Deore XT stopping power for the trail. Choose a 2-piston or 4-piston brake set, or grab a single XT lever for your rebuild. Why You&';ll Love It Mineral oil system. All of these run Shimano&';s mineral oil. Clean cockpit. The M6100 and M8100 levers work with I-Spec EV, so your shifter can mount directly to the lever. Fast engagement. Servo Wave on the M6100 and M8100 levers brings the pads in quick for a shorter free stroke. Room to go big. 4-piston options bring more pad to the rotor. The Lineup Option Setup Caliper Pads Hose Deore M6100 Rear Right lever, rear 2-piston Resin 1700mm Deore M6100/M6120 Front Left lever, front 4-piston Resin 1000mm Deore BL-M4100/BR-MT420 Rear Right lever, rear 4-piston Resin 1700mm Deore XT 8100 Front Left lever, front 2-piston Finned metal 1000mm BL-M8100 Right Right lever only Lever only Lever only Lever only Compatibility All calipers here are post mount. Check your frame and fork mounts and rotor size Pair with the rotor that fits your bike Who It&';s For Trail riders upgrading or replacing a brake, from a single lever to a full lever and caliper set. Why buy from Gravity Coalition: we&';re a real Wasatch Back bike and ski shop, not a warehouse. Stop by our Midway or Heber City shops and we&';ll help you get the right part, or order online and we&';ll get it out the door. Questions? Call us at 801-448-6096.