I have a manual and the symptoms are a little different but there is no gradual on the brakes - they are on or off. Makes for very jerky driving when going slow or even upon first application of the brakes.
Even though they aren't brake by wire there is some computer intervention here will allows for the hill holding and other "advantages".
I'm hoping a software fix will come along.
Service people at stealers aren't interested in any non-normal problems.
2011 328xi black on black. Nav, connect, apps, Sirius.