1. Manual block: it needs to be delivered. Please go to the 4S shop for inspection in time.
2, automatic car: the sound when slowly lifting and stepping on the brakes is normal.
If it is in winter and the rear wheel of the car is braked by drum, don't worry too much. Most of them are caused by frost inside the brake system, which won't happen for a while. If there is something wrong when the weather is not cold, you should have a good check.