You should inspect them. They should be smooth, without pits or scores and sit reasonably in the races. If they are not you should replace them or find a garage where they would do it.
front wheel bearing bad on a motorcycle
You'll hear a noise similar to...cats fighting? if a wheel bearing is going bad. Also, the car will tend to pull to the bad bearing side, if it's a front bearing. If you're hearing noises that aren't "cats fighting" yet, touching the suspected wheel (under any hubcap) with a wet rag (since it could be very hot), right after stopping, then checking temp of rag, can indicate a wheel bearing failure.
You can tell when your wheel bearings need replacing is when they are making unusual noises. For example: squealing, groaning, chirping or cracking noises. If this happens, get it checked out right away.
if there is any play at all in the bearing on the tensioner,it needs replacing. also if you hae the correct new serpentine belt and the tensioner does not keep the belt tight when installed properly,you need new tensioner
Most of the time you can hear a bad wheel bearing but the only 100% sure way to know is to remove the bearing and inspect it.Most of the time you can hear a bad wheel bearing but the only 100% sure way to know is to remove the bearing and inspect it.
tap on it and if it rattles ,its done
if you find out tell me what preload is
a humming sound usually heard on cornering, if heard when going left, its the right bearing and vice versa
If you suspect a flat spot on a tire examine the tire closely. You should be able to see a flat spot. To determine if your car has a bad wheel bearing rotate the wheel. A bad wheel bearing will often make a grinding sound as well as feeling rough as you turn the wheel. A bad wheel bearing may also shake or wiggle. It will also cause a car shaking problem.
With the car or truck running disconnect only the positive side of the battery ... if it stays running that means the alternator is good if it dies then it needs replacing
As with any bearing going bad it would growl and the noise would increase with speed.
The way to tell if you have a bad wheel bearing is when you are driving and go into a hard corner. The wheel that is on the inside of the corner stops making a humming noise. I just replaced my Driver Rear bearing on my 2004 VW Gti