Shimano's new Deore 12-speed group includes an updated Deore BR-M6120 disc brake caliper. At the heart of the new M6120 is a powerful four-piston system which provides high stopping power and fast retraction after lever release for superior modulation and sequencing of small and large pistons. Smaller pistons engage the input rotor followed by larger pistons to withstand high braking forces. This reduces rotor sway under load and also reduces noise and vibration, helping you enjoy your ride rather than worry about the noise of the bike.

M6120 keeps your lines and your garage clean with One Way Bleeding technology , which, as you understand it, provides one-way pumping to prevent air bubbles from getting into the lines which improves braking feel and safety. Also add a funnel tool for easy cleaning. You will also be pleased to know that Shimano's high-performance ICE Tech technology keeps temperatures under control during long periods of braking.