How does dynamic stability control work?

It's related with the wheel spin ASR.

The rotation of the rear wheels is electronically controlled and co related with the speed of the car, the steering position, the brakes and the torque of the engine; when the computer making this analysis over 100 of times/ second find something wrong can adjust / cut the power to the wheels, brake one rear wheel in order to keep the car on the right trace!

Usually can compensate mistakes of the drivers of maximum 20-30 km/h over speed but cannot save you from big mistakes!

Be careful and drive safe! Speed on slippery roads kills!