Why isn't my Audi Quattro AWD system engaging?

I recently purchased an Audi Quattro and noticed that the AWD system doesn't seem to be engaging. When should I expect the AWD to kick in?

The Audi Quattro AWD system is designed to primarily run in front-wheel drive, only engaging the rear wheels when additional traction is needed. In normal conditions, only about 15% of the power is sent to the rear wheels.

Check to see if your AWD system is equipped with the 'hill-hold' feature. If so, the AWD will automatically engage when starting on a hill to prevent the vehicle from rolling backwards.

I suggest taking your vehicle to a certified Audi mechanic to have them run a diagnostic check on the AWD system. It's possible there may be an underlying issue causing it to not engage properly.