I assume cruise control is off.
Active cruise maintains speed and will brake as needed to prevent over speed.
The 4 wheel drive system can feel as though braking is occuring but it is just the torque resistance.
Hill descent control only works at low speeds so I doubt that is the issue.
Try putting the car in neutral when going down hill, the car should release and go freely downhill.
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2011 535i
2008 VW GTI
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