After you get the car back from the dealer, drive it on an open highway at full speed for a while (5 minutes?). Find a safe place to stop and turn off the engine. Check the temperature of the wheels. If there is an overheated brake, you can smell it. Touch the center of each wheel with caution (don't get burned). If the wheel is too hot, you may have a problem. I cannot tell you how hot it should be, but you should not smell burning.
If 5-minute driving is not long enough to surface the problem, driving another 10 or 20 minutes more (open highway with little or no usage of the brake). If there is a problem of brake over heating, you should be able to tell now. The problem caliper is much hotter than the rest.