New Bicycle - Brakes Squeak
Take the new bike to the bike shop where you purchased it and ask for the brake pads to be adjusted. They may need some break in time/miles, but usually an adjustment of the brake pads so that the front of the pad makes contact with the wheel first, will keep the pads from squealing when used. We're talking millimeters in difference...hardly noticeable at all with the front of the brake pad being closer to the wheel. This reduces the vibration you're hearing.