-Marlin-

Wierd and intermittent, but I release the brakes and hear a boing/knock when I accelerate from a stop. Coincides with moving forward and coming from the front? (Only once)

Tranny, something need grease in a linkage?

I hate going back to the dealership for a 3rd time since buying it a month ago. 09' C63 21K miles.

Harold1898

sounds like it could be brakes binding. Have you checked the search engine on the web site?

-Marlin-

Yes, I did see that. But it doesn't feel like the brakes. I will take it in and see what's what. Maybe a grease and go.