Roaring sound in rear end

jack up left rear and try to jiggle tire.if there is play could be wheel bearing.remove tire and check brake shoe/pad for wear.also check if exhaust is rubbing anywhere.bad rear speaker?lion hiding in backseat?lol

there may be sticking of mud on the brake pads, try to clean with water pressure, if not the check your bearings.

Three quick thoughts, check the universal joint by grabbing the drive shaft with the
vehicle in park and check for freeplay at both ends.
(this is the most likely cause).

Then axle bearings. (look for leaking seals, and also any broken/missing brake pad
"nails" or stuck self adjusters or even rust on the drum edge).
.
Third would be the ring and pinion followed (requires draining and pulling cover).
Hope this helps

If roaring comes with trumbling in steering wheel, means you have problem with brake disk
if just noise with feeling of low brakingability: need to change brake pads

The brake pads have worn out and now the metal backing plate of the pad is pressing on the the brake rotor. You will need to have these brakes repaired soon! When the pads wear down to this point, they will have reduced effectiveness at the very least. The pads can actually fall right out of their holders and braking would be lost. Check my name's icon picture, this was the case. You will need to have both rotors replaced and a new set of brake pads installed.

It could be a number of things. First check your brakes for any rocks or excessive dirt. Second, check to make sure you are not in need of new brake pads. Brake pads are equipped with a tab that starts making noise when its time to replace your brakes. Third, have the bearing checked. Once the bearing get excessively worn they will start making a squeaky sound. Also have the shocks checked. the bushing worn out in shocks can also cause the noise. The best bet is to have your local mechanic inspect your front end for any wear. Once he does this, he can compile a list of parts that need replaced. Then you can replace or fix it yourself.

This is just because of the warned out wheel bearings just replace the bearings of the rear wheels to sort out this issue.

I certainly would take it back to the shop that performed the brake job and have them investigate. If it was not making the noise prior to the repair there is a good chance the noise is involved with the brakes. A possible loose brake pad, a sticking caliper(caliper pins may need to be lubed) or any number of things could be wrong.

If it's a scraping sound, when does it happen? If it's when you hit the brakes, then it's likely your rear brake pads/shoes are down to the metal and are scraping. This can happen when you're not hitting the brakes, however. Bad wheel bearings are usually a moaning/roaring sound that increases as road speed increases. Ditto that for differential bearings - if they go out, you usually get a roaring noise that increases the faster you go.

sounds like a wheel bearing going out