Originally Posted by DannoXYZ

The end of this debate will come when Shimano offers electronic disc-brakes with ABS next year. Electronic-solenoids to replace problematic hydraulic calipers that are difficult to bleed and can overheat. Dual-pistons with auto self-centering eliminates the wheel-swap adjustments currently needed. They pull the pads further away from the rotor than hydraulic/mechanical disc-brakes when brake-lever is released for zero drag and noise.The pistons will also self-retract fully when the QR lever is released, to make removing and installing the wheel easier.

ABS will maximize tyre-grip and traction. Now, inexperience riders don't have to fear the brakes and going over the bars. Gel-based longitudinal G-sensor combined with front & rear wheel-speed sensors, the computer can detect the limits of adhesion and let up on clamping-pressure to prevent rear-tyre sliding and front-endos. This allows maximum-braking under any condition, dry, wet, muddy, oily/slick/iced roads and you can even go around corners under maximum-braking and the computer will reduce braking-pressure as needed to maintain cornering-traction.

Available as Di2 upgrade option for $1995 or new for $2995.