I agree, that does not sound like brakes or bearings. Maybe a splash guard?
I know you said slowly, but was it a big speed bump? Was it a straight hit or at an angle?
Does the noise change with engine speed or vehicle speed?
What if you wait to hear the sound, then shut off the engine? If manual, shift to neutral. Still there? Does turning affect the sound?
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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