pinza freno a disco idraulico a 4 pistoni br mt520With a robust 4 piston design, the SHIMANO MT520 hydraulic disc brake increases rider enjoyment and confidence in the bike. FEATURES High brake performance increases rider confidence and enhances enjoymentWider contact area with dual diameter opposed piston designFour piston caliperHighly responsive braking force for greater controlQuick initial pad contact and controllable brake force modulationSERVOWAVE Stable braking and longer durabilitySlim and