What causes a right front wheel to squeak once per rotation of the wheel and you just had new brakes put on the car?

A right front wheel squeaking once per rotation after new brakes have been installed could indicate that the brake pads are not properly seated or that there is debris caught between the pad and rotor. Additionally, it may be a sign of a brake pad wear indicator making contact with the rotor, or it could be related to a wheel bearing issue. It's advisable to have a mechanic inspect the installation to ensure everything is functioning correctly.