The SHIMANO DEORE XT M8120 caliper features consistent braking performance and reliable stopping power in all conditions. The 4-piston caliper instills greater downhill confidence and control. Quicker Piston retraction Reduces disc brake rotor wobbling noise and increases braking power by 10 vs. M8000 Four Piston Banjo type connection and inside hose routing Superior modulation gives you greater control High braking power instills greater downhill confidence and control Quick and easy assembly