We own a 2013 A6 with 19,000 miles. After driving 10 or more miles, at 40 to 60 mph, a howling sound comes from the front end. The sound will temporarily stop if the brake is tapped, only to resume when brake is released. The dealer replaced the right front bearing assembly around 4 months ago. Shortly afterward, the sound came back in the left front and dealer replaced the left front bearing. Everything was fine for the last few months but today, the noise from the front right is back. Any clues?

 

Could be a bad bearing... again. I'd insist the stealer......er....dealer work with you on this one. I've had wheel bearing assemblies last for at least a 100K miles or more. There is no reason why this new one failed unless it was improperly torqued.