He's right. It's awful, but mine does the same thing in the garage on a level surface. You can't slowly move the car forward. The brakes grab really badly.
And, it's not just he 3 series. My nephew has a new 550 and his car does exactly the same thing.
It would be nice if you could switch off the hill holder feature, because this braking thing makes you crazy, besides almost hitting the wall each time.
Sorry, but that's how these cars work. Doesn't make it right, however.
Larry in Los Angeles