UPDATE.

The issue with my Brakes were with Master Cylinder (there were no fluid leaks), the follow up issue was that the tech at Mall of Georgia Chrysler dealer at North of Atlanta, had forgotten to install the bushing (gasket / seal) between the master cilynder and power booster causing the brakes to malfunction and result in a vacuum leak between Master Cylinder / Booster which subsequently caused engine light to come-on. I have logged a compliant with Chrysler Customer Service and have written the dealer as well.

To fix the leak issue, I took the car to EdVoyles Chrysler and they found the Master Cylinder gasket to be missing and once they replaced all is working fine, my brakes are firm and tight.

My research on this topic showed that, it is real important that you use the Original equipment parts and specially brake fluid from Chrysler. This car being German build and most / all part being German the brakes should be firm and should not fade or slip.

PS, on a side note, while my car was at EdVolyes, it had a rear windows detachment, which was also fixed by replacing the whole convertible top at no charge, it looks like Chrysler warranties the top for 100K miles (real good thing done by Chrysler).