How often do a car’s ball bearings need to be replaced?

Question by HotGurrlz: How often do a car’s ball bearings need to be replaced?
Talking about a mid-size car (Nissan Skyline) that does a moderate amount of driving both in cities and on the open road.

Bonus question: What do the ball bearings do?
I’m talking about the ones in the wheels(/steering?)

The car is starting to make the funny noise it did last time they needed replacing.

Is it dangerous if they ‘fail’?

Best answer:

Answer by dlmrgnk
There is no need to replace ball bearings in your auto until they fail. They are found in so many places they are too numerous to mention.

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