aztecsjar

I've owned my F Sport for 13 months and have less than 8,000 miles. At first I had problems with front brake squeals that required several trips to the dealer service department and a conversation the Lexus Customer Service. The squeal has not returned, however, when I apply light foot pressure (forward or reverse) the brakes now growl (errrrrrrrrrrrrrrr ). I have been informed by the service department that this is normal for a F Sport and nothing can be done to fix the noise. I do not believe that I'm being told the truth. Has anyone had a similar problem with their 2013 GS 350 F Sport? Any suggestions as to where I go from here. This is my fourth GS and I have never had any problems with the first three.