1998 Honda Accord how do I know if bearings are bad?

I’m currently driving a 1998 Honda Accord that I am told has new brakes. But when I brake, it sounds like machine gun fire in the back trunk and it sounds like I am dragging cans behind the car - nothing is hanging down below. What is this? Bad Bearings??? Thank you!

If it were bearings you’d hear it when the car is moving…WITHOUT the brakes.

If hear the noise take it to a shop. Brakes are nothing to play around with. Its the brakes.