Shimano Deore BR-M6120 Disc Brake LeverMaking its way onto the new Shimano Deore 12-speed group is the updated Deore BR-M6120 Disc Brake caliper. At the heart of the new M6120 is the high powered four-piston system that offers high stopping power and quick retraction after letting off the levers for excellent modulation and a small and large piston engagement sequence. Smaller pistons engage with the incoming rotor, followed up with larger pistons to handle the larger stopping forces. This reduces rotor wobbling under load and also reduces noise and chatter to help you enjoy the ride instead of fretting over concerning bike noise.Powerful and grabby disc caliper for Deore 12-speedFour-pistons boosts downhill confidence and controlRotor wobbling under pressure is reduced as well as noise levelsPistons quickly retract for precise and intuitive operationOne-way bleeding keeps air our of your linesBrakes are not pre-bled, will need bleeding upon install