The xt m8000 i spec ii disc brake assembly from shimano is a powerful fully bled xt hydraulic servo wave disc brake it comes without rotors or adapters giving you complete freedom to customise the brake to suit your set up the brake uses a short stroke servo wave mechanism which allows quick pad engagement and more power for aggressive riding the oversized 22mm twin phenolic pistons optimize heat insulation as well as keeping the brake lightweight and stiff to complement the pistons inside