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That would be the button which activates the hill descent feature on your X5.
Hill Descent allows a smooth and controlled hill descent in rough terrain without the driver needing to touch the brake pedal. Push the button and the vehicle will descend using the ABS brake system to control each wheel's speed. If the vehicle accelerates without driver input, the system will automatically apply the brakes to slow down to the desired vehicle speed.
ECS Tuning
Last edited by ECS Tuning; 11-18-2011 at 03:31 PM.
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