The short version
- Four checks before the wheel goes on, and three after the first drive.
- The bench checks catch fitting errors. The road checks catch clamp and seating errors.
- A hub noticeably hotter than the one opposite it is the single most useful signal.
- Anything that gets worse rather than settling is a redo, not a break in.
Most of what goes wrong with a wheel bearing job is discovered a week later, when it could have been caught in the ten minutes before the wheel went back on.
These are the checks for a wheel bearing installed correctly, in the order they are useful.
Is the wheel bearing installed correctly? Checks first
- Turn the hub slowly by hand through several revolutions, feeling for consistency rather than lightness.
- Rock it top and bottom with both hands, looking for any perceptible movement.
- Check the flange sits flat with no gap anywhere against its mating face.
- Confirm the torque on the hub bolts and the axle nut with a wrench, not with a gun.
A correctly fitted sealed hub has no perceptible play at all. Any movement you can feel by hand means something is wrong.
A serviceable tapered hub is the opposite case. It needs a small measured play, which is on the adjustment page.
What each check tells you about a bearing installed correctly
| Check | Catches |
|---|---|
| Slow rotation by hand | Crooked fitting, damage during pressing |
| Rocking for play | Snap ring not seated, loose bore |
| Flange flat against the face | Debris, hub not pulled fully home |
| Torque confirmed with a wrench | Over clamped or under clamped hub |
| Hub face cleaned | Runout and vibration later |
| ABS sensor reconnected and clipped | A warning light on the test drive |
It is the difference between a job that is finished and one that comes back as a brake pulsation in a fortnight.
Why so little rust causes so much runout is on the vibration page.
Torquing the wheel
The last mechanical step, and it undoes good work more often than anything else.
Run the nuts down by hand, then torque in a star pattern in two passes. An impact gun cannot do this, which is on the impact wrench page.
Re-torque after fifty to a hundred miles. Fresh mating surfaces settle, and nuts that were correct can be loose afterward.
The first drive
Drive gently, then stop and place a hand near each hub in turn, comparing across the axle.
Warm is normal. One hub clearly hotter than its opposite number is not, and it means the clamp or the fit is wrong.
Do it by comparison rather than by absolute temperature. The other side is your reference.
What a hot hub is telling you is on the hot hub page.
What to listen for, and for how long
A little settling noise that fades over the first week is normal. Anything that grows is not.
A hum that increases with road speed and does not fade means the bearing is unhappy, which is on the still humming page.
A scrape tied to wheel speed is nearly always the dust shield, and it is on the scraping noise page.
A dashboard light points at the sensor or its connector rather than the bearing.
The honest signal that it needs redoing
A correctly fitted bearing gets quieter and freer over its first few hundred miles.
Noise, vibration or heat that increases means damage during installation, and driving on it turns a repeat job into a knuckle as well.
What normal settling actually looks like is on the break in page.
Common questions
How do I confirm a wheel bearing installed correctly?
It turns smoothly and evenly by hand, has no perceptible play if sealed, sits flat, and runs no hotter than the hub opposite it.
Should there be any play?
Not on a sealed hub unit. A serviceable tapered hub is different and needs a small measured end play.
Which check proves a wheel bearing installed correctly?
Comparing hub temperature across the axle after twenty minutes of gentle driving. One hub clearly hotter is a stop and check.
Do I need to re-torque the wheel nuts?
Yes, after fifty to a hundred miles. Fresh mating surfaces settle and correctly torqued nuts can end up loose.
Is some noise normal at first?
Slight settling noise that fades is normal. Noise that grows is not, and it means damage during fitting.
Can I check it with the wheel on?
Poorly. The tire flexes and masks small movement. The useful checks are done with the wheel off.
What if the ABS light comes on?
Check the sensor connector and routing first. That is a sensor problem far more often than a bearing problem.