Odd rubbing noise

Everything seems fine with the car except this noise that then makes the anti-lock and trac lights to turn on. Not too long ago I had both front hub assemblies put on and also changed both front calipers but it didn't do the trick.

When at low speeds or if I hit a bump, I get this brr rubbing sound and then it goes away. It's not very long, maybe two or three seconds. It causes all the lights to come on on the dash but usually won't repeat itself until the next bump or two. Last night it happened while driving on a perfectly flat road and I'm clueless. It does not shake, rumble, squeal, or screech.

I hope you guys can help us. I want this car to be as safe as can be as my wife uses it often.

Thanks,
e~