Agree on checking it out yourself. Dealers want to sell you brakes ASAP for nice big profit margins (I was quoted $1,200 for front pads+rotors). IMO, this is because with MY 2015 and later,
the maintenance plan was reduced to 3 years/36K miles and doesn't cover brakes (it used to be 4/50 and cover brakes).
I did an oil change at 26K, they said the front pads were at 4mm and needed to be replaced. I declined, bought the Ultimate Care Plus package (which covers brakes), and then a new service advisor measured it at 5mm at 27K. The first service advisor was super dodgy after this and refused to replace brakes, so I refunded the Ultimate Care package. Today I'm at 40K and I bet will be fine through 50K.
Unless you drive like a maniac or track every month, you won't need brakes at 25K miles. Also read:
https://www.edmunds.com/car-buying/w...ake-money.html. I also believe the iDrive maintenance system is also intentionally misleading since it gets stuck at "3200 miles" (mine have been there since 16K) making it easier to say "hey, you will need brakes soon, replace them now!)