Sorry I'm late to this one. I have the 806's sister, a Citroen C8.
It's straightforward FWD with disks at the rear operated by unequal length cables from a handbrake lever between the driver's seat and the door. AFAIK there is no AWD option for the 806.
The handbrake has an "out-of-the-way" position disconnected from the ratchet where the handbrake looks off but is actually engaged. I suspect this might be the case here. Look to the handbrake; lift to click into position, depress the button and release the brake. Or it's broken; still suspect the lever mechanism.
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