Recently purchased a 2020 acadia denali. when parking at any incline the parking brake automatically turns on. dealer is not sure why, but no where in the manual does it state this is normal. to disengage brake vehicle has to be put in gear with foot on brake to turn off. the parking brake should turn off when vehicle is in park with foot on brake but it does not. dealer is unsure of issue and has an open case with gmc to investigate.