the front driver side. My car ran smooth and sounded good. Now when I drive a round 8+ miles at around 45+ mph like on freeway all the sudden it feels like I have a flat tire. There is no steering wheel shaking but the front shakes and sometimes quite a bit. If I brake no steering wheel shaking and if I slow way down it stops. I checked the lug nuts and they are fine. The tires are fine. They shaved my rotors when brakes were done. Rotors look OK. No visible object in tire, brakes or well. It sounds so bad everyone it happens so I stop and nothing. I won't drive it now. Help.