PSM, which comes as standard, is an automatic control system that stabilises the vehicle at the limits of dynamic driving performance. Sensors continuously monitor driving direction, speed, yaw velocity and lateral acceleration. Using this information, PSM computes the actual direction of motion. If this direction deviates from the desired course, PSM can, for example, initiate braking interventions targeted at individual wheels in order to stabilise the vehicle.

Under acceleration on wet or low-grip road surfaces, PSM improves traction using the ABD (automatic brake differential) and ASR (anti-slip regulation) functions. For a pure, active driving experience, PSM can be deactivated but it will automatically reactivate if necessary for safety.

PSM comes with two additional functions: precharging of the brake system, enabling the maximum braking power to be achieved much sooner; and brake assist, for maximum deceleration in a critical situation.

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