Reversing noise on 2007 Nissan Sentra

When I reverse with foot slightly on the brake, rolling down incline there is a wining/moaning noise, not really grinding but more like a moan. This is when it is a cold start. Seems like it would be back brakes, but the dealership said brakes are good. Do you have any ideas? Oh, and it is automatic

Asked by for the 2007 Nissan Sentra
If your car has a manual transmission the reverse gears are straight cut and will possibly make a whirring noise when cold and in reverse.
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