Mine was built after that date, but I'll still keep my eye out for a letter. I've just been through a pretty harsh winter (which the D passed with flying colors) and nothing abnormal with the brakes.
In not-really-related news, my D is in the shop for it's first unexpected repair. I went to fill up the other day, and gasoline was leaking as they were trying to fill it. (Not from the tank, but from the inlet pipe.) Turns out to be a failed check valve...which turns out is on back-order.
So, the Durango sits at the dealer now waiting on a part.
No hassles from the dealer and they were very apologetic...I'm in a 2011 Grand Cherokee as a loaner for now.
Other than that, I've had 5 months and 11,000 miles of trouble - free driving. Love the Daddy Wagon!