The success of BMW's intelligent xDrive all-wheel-drive technology is based on quick, electronically-controlled power distribution to the front and rear axles. When combined with the near 50-50 static weight distribution of any BMW, xDrive can prevent the tendency for the vehicle to oversteer and understeer as long as possible, reducing the need for Dynamic Stability Control (DSC) to provide electronic assistance.
BMW's Dynamic Performance Control was presented for the first time in the BMW X6 and is now featured in the BMW X5 M and the BMW X6 M. It enhances driving stability in demanding situations and is thus perfectly suited to a powerful M vehicle. Vectoring of torque between the right and left rear wheels (both on throttle and off) significantly improves steering precision and tracking stability at all speeds, with DSC being required to stabilize the vehicle only under extreme lateral acceleration. Ultimately, this offers the driver an unparalleled standard of performance, agility, balance, and traction, and re-establishes the benchmarks in drivetrain and suspension technology for all types of performance-oriented vehicles.
In the BMW X5 M and X6 M the potentials of both xDrive and Dynamic Performance Control are maximized by BMW M, with the driver able to activate the M Dynamic Mode (MDM) with the DSC button on the center console or the steering wheel-mounted M Button. This mode raises DSC thresholds of intervention and ensures throttle-steering behavior typical of BMW M by shifting the xDrive bias more to the rear and involving the Dynamic Performance Control in the process. A pictogram in the Control Display in the instrument cluster allows the driver to monitor the activity of Dynamic Performance Control and xDrive through a clear visual depiction, which shows the driver how much power is being distributed to each wheel.
As a result, M Dynamic Mode allows maximum speeds in bends and on winding roads with the DSC system intervening only when the vehicle reaches the absolute physical limits of grip. Even under maximum load in the apex of a bend, the vehicle follows steering inputs with tremendous precision, giving the driver very high speeds when exiting a turn in the interest of optimum performance. Last but not least, DSC may be completely deactivated by experienced drivers at the touch of a button.
Beyond the stabilizing effects of Dynamic Stability Control provided by individual brake activation and engine power reduction under extreme conditions, DSC in the BMW X5 M and X6 M includes a wide range of additional features tuned to BMW M standards to promote safe and exciting driving. These include ABS anti-lock brakes, Trailer Stability Control, Hill Descent Control, Dynamic Brake Control which maximizes brake force when required, Cornering Brake Control for advanced trail-braking, Brake Fade Compensation for extreme driving conditions, automatic Brake Drying when the windshield wipers are activated, Start-Off Assistant for driving on steep hills, and a braking function for use by the standard cruise control.
Both vehicles come with an electro-hydraulic parking brake, which features the Autohold (Auto H) function. Auto H is a convenience feature that holds the vehicle in position as soon as it comes to a stop at an intersection or in stop-and-go traffic, without requiring the driver to hold constant pressure on the brake pedal. As soon as the driver touches the accelerator again, the brake is instantly released.