[After you get the car back from the dealer, drive it on an open highway at full speed for a while (5 minutes?).
Please don't do this on US roads. There is absolutely no reason to drive fast to check brakes. If you are worried about dragging a good drive through the neighborhood with a bunch of stop and go is the test. Driving fast without applying the brakes won't test much other than your driving skill and recklessness.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician