My wheel barings have 'gone'. I can tell because my car is now making a humming sound when it moves, which gets deeper and louder, the faster it gets. I have a few questions about wheel barings. Please read to the end. 1. What are they? 2. What do they do? 3. Where do they go? [I know its somewhere near the wheels, else why call them 'wheel' barings?] 4. Why do they make the car hum when they 'go'? 5. Having had new wheel barings 6 months ago, why did they 'go' again after just 3 months? I am more than slightly agrieved that the car has to go and have these mended yet again. [tis an 04 Renault Megane CC] Thank you for reading. / 6. Having replaced the first faulty [?] new wheel barings, how come the newest replacements have also 'gone' - also after 3 months?