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It might be possible that it's one or more of the rotors, I drove a 335i M Sport with some other M Performance add ons once and whenever I would hit the breaks the car would make the same kind of noise as yours does, maybe not as high pitched, but the car would also rumble a little. I narrowed down the cause for it to most likely be the rotors. It was defiantly in worse shape than your dads M235i. I would get that checked out and possibly fixed by a professional before you potentially see more serious problems down the road.
I'm surprised that such a brand new car like the M235i is already having problems, I have one myself. I'm guessing it's more of a defect, unless you drive that thing harder than hell, then in that case maybe something might have been damaged.
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2014 ///M235i
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