Auto park brake logic

[JustDan]

Does anyone understand the logic controlling the auto park brake. I press the button to turn off the car and the shifter goes to park but the park brake only engages maybe 75% of the time. Is there some trigger like park angle or something

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[Danager]

I have only had my truck for a couple months. The park brake has auto-set 3 times. Each time was when the truck rolled and kind of came to a jerking stop after I put the truck in park - what I assume is the transmission settling on the parking pawl.