Hi thanks for the replies. The car was bought new at the dealership and delivered with only 40 miles on the odometer. The service manager is just sticking to the facts; Warped rotors = replace under warranty...for now. The suspension on this thing is a nightmare. Go over rumble strips around 35 or 40 and you get the back end doing a “fishtail” like motion which is sometimes enough to have to correct with the steering. My neighbor has the same car and has experienced the “fishtail” sensation as well. The feedback coming from the suspension is such that I actually don’t feel safe in this car. I asked them to check error codes and to do a search for other cars of this type that are experiencing this problem but I can’t be sure they ever did that. I did a recall check and don’t see any. My next step is to have a meeting with the dealership manager.
Do you have the damaged rotors handy?
I suggest that you take them to a mechanic and rotate them to see if they are really warped.
I'm saying this because rotors are machined by lathes and the manufacturing QA process is very stringent, not to mention that the rotors are an "Original MB Spare Part".
Something fishy is related to the suspension that needs to be caught otherwise your vehicle is not safe to drive, and this is a bullet that you have to put in your gun when discussing this matter with the dealership manager. A brand new vehicle (not to mention the hefty price tag) should not incur three sets of rotors within 4000 miles.
You need to know the damage pattern on the rotors so you can discuss intelligently with the dealership manager and his maintenance manager.
Maintenance managers at dealers are not reliability experts and they quit (like 30 years ago) being smart in diagnosing any failure mode to cost effectively and safely fix it. They tend to visually notice the physical failure and then apply what the MB Bible (WIS) instructs on how to replace.
With regard of recalls, I highly suspect that this issue will pop up to manifest a recall unless the NHTSA notice an accumulation of reported failures that constitutes one.
Good luck... Please please stay safe and abandon the vehicle if you don't feel safe enough to drive it.