Beef failure

Good night, I'm not a mechanic, but I would like to see if they help me diagnosis and recommend. My car is a VW Fox 2007, for a short time I started with an annoying sound and that stuns when the closed virtualities go, as a bearing problem, it is as if a motorcycle was behind my car. My question is generally in the rear bearing if it is dressed, I must change young man and rolinera or only rear roline.

I have no problem helping you but I don't know what is the waiter and knee, if you tell me there is no problem, but to advance rear rpdimientos and all bearings are changed complete baskets and radiations.