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Power off and parking breaks

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So you're saying that the normal P is just applying just enough pressure on the brakes to stop the car from moving and if it was on a hill it could possibly roll away? Why would the normal park not be "maximum pressure"? Why does the engaging the "handbrake" cause a secondary action that makes a mechanical sound?

Applying maximum pressure when it isn’t necessary can wear out the motorized calipers more quickly. This was explained in a previous version of the owner’s manual but is not present in the current version.

The extra mechanical sound is from the motorized parking brake calipers applying additional pressure.
 
When you power off the car in an inclined driveway for example, does the "park" breaks stay on? Or would i have to set blocks behind the wheels?

No, the parking brakes do not release when powering off the car. In fact, if your 12 volt battery dies while the parking brakes are applied (otherwise known as the car being in PARK), you need to jump the car in order to get them to release. This is covered in the owner’s manual.
 
Nowhere in the manual does it state there are 2 different levels of activation. My thought is that holding the stalk button in activates the mechanism again, the same as it does when simply shifting to Park. Like pressing the brake pedal twice, it doesn’t clamp the brakes any tighter.