Typicaly bearing are replaced when they are either cracked or there is too much 
play when you push and pull on the wheel

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> 
> 
> How do you know when the front wheel bearings need to be replaced? 
> 
> Do they get noisy? 
> Does it become impossible to adjust them within spec? 
> Do they pit and fracture like a damaged bicycle bearing? 
> Should you just replace them at some mileage interval? 
> 
> An inquiring mind wants to know. 
> 
> I?m on a campaign of cleaning and repacking those bearings in my 
> ?fleet? as I replace front brakes. But maybe I should be replacing 
> some of these bearings. 
> 
> When the dealer serviced my car, they would sometimes repack the front 
> bearings and sometimes they would replace them. I can?t figure out how 
> they decided. 
> 
> Ned Kleinhenz 
> ?95 E300D x2 
> ?85 300D 
> ?80 300TD 
> 
> 
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> 
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