Shimano xtr m9000 race disc brake leverthe xtr m9000 hydraulic disc brake systems are also rider tuned in race and trail versions as not all riders come down the same mountain at the same speed shimanos legacy of leading brake design stems from its dedicated study of the components of control heat power and stiffness new xtr m9000 brakes offer varying levels of heat control from an insulated piston glass fiber phenolic and insulated pad coating that created 10 percent more heat resistance