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Originally Posted by HighlandPete
Autohold uses the service brakes, (the hydraulic system). Not the electric parking brake.
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This is correct. From newTIS:
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The automatic hold function is activated using a button behind the parking brake button. The button is connected to the Dynamic Stability Control (DSC). When the function is selected, the vehicle is hydraulically braked from the first application of the brake by the DSC until it comes to a complete halt. When the engine is switched off, the parking brake assumes the holding function.
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Which is why autohold and parking brake are interlinked and both are disabled if there is a parking brake failure: it cannot do the last sentence of "parking brake assumes the holding function" if the parking brake is malfunctioning, leading to a risk of a vehicle rolling away when drivers expected it to be held.