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No laughing...  What causes a wheel bearing to need replacing? I've searched the site with answers to cost and how, but nothing on why. Thanks.
99 Sport SE - Zetec
Mods: My wife vacuumed it last spring  , my son wiped up his hot chocolate spill  in December. My daughter found the tooth she lost last week .
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Are you asking why it wears out, or what happens when it wears out? If you're asking why it wears out, all moving parts will eventually wear out due to friction. The only thing keeping the moving parts from wearing is a thin coating of grease, which is bound to wear out eventually. As far as what happens when it wears out, the metal on metal contact eventually causes enough wear that there is a lot of play between the bearings and the race. This lets the wheel shimmy and shake, and I suppose ultimately fall off.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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Joined: Dec 2001
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in the case of my fathers car is was the conditions of the roads he drove to work every day. they were bad roads that were not the best and were often wet. I beleive water got into the bearings and they started to rust, causing the noise. this would go with the fact that the passanger side went before the drivers side
- 95 Mystique LS - Zetec/5spd
- 99 Contour SeVT Sport - Duratec/5spd
Official NE-CEG Contour/Mustang Family
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Originally posted by bentleywarren:
Are you asking why it wears out, or what happens when it wears out? If you're asking why it wears out, all moving parts will eventually wear out due to friction. The only thing keeping the moving parts from wearing is a thin coating of grease, which is bound to wear out eventually. As far as what happens when it wears out, the metal on metal contact eventually causes enough wear that there is a lot of play between the bearings and the race. This lets the wheel shimmy and shake, and I suppose ultimately fall off.
Would this include shaking at speeds over 50 and excessive shaking on moderate braking? I am exeperiencing this and since wheels bearings have been the subject of alot of posts i thought i would ask.
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FLCEGKid,
When mine went out, it was a mild, uniform vibration. It felt like I was driving on a roughly paved road. Maybe I just repaired it before it got very bad, but the symptoms were not severe, and they existed at all speeds. It was noticeable when I went straight ahead, or when I turned one direction, but the noise and vibration stopped when I turned the opposite direction. When I jacked up the car, and shook the wheels, there was quite a bit of play in the wheel with the bad bearing.
I'm having symptoms now very similar to what you describe, but I don't think it's the wheel bearings. I'm getting a slight to moderate vibration most of the time, particularly at speeds above 50, but very noticeable when I brake. I wish I knew what it was. From my experience, and from what I've read in other posts, a tell-tale symptom of a bad wheel bearing will be that the symptoms stop when you steer to one side, but not to the other side. I'm not getting that now.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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Joined: Oct 2003
Posts: 175
CEG\'er
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Mine is going out right now and it sounds like a big concrete roller rolling on the pavement. Its a wierd noise. Mine has went through 4 in 3,000 miles though. The guy that was fixing it just now noticed that it was missing the outer snap ring. I think this explains the constant wearing out of the bearing in my situation.
Blaze
1996 Sport LX Desert Violet Pearl(purple)
2.5 liter V-6
Name:(Grape)
Finally Fixed
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And after the second they never charged you right???
2000 CSVT Silver Frost: #942 of 2150
HID Projectors and Fog Light Mod, Optomized TB, MSDS headers
2003 Silverstone Z
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They charged me every time telling me that because the car was wrecked it was eating wheel bearings. The car was wrecked at 61,000. It would of showed up before now. I cannot get the snap ring anywhere. Hardware store---dealer---no where. Would the missing snap ring cause the bearing to eat up and go out?
1996 Sport LX Desert Violet Pearl(purple)
2.5 liter V-6
Name:(Grape)
Finally Fixed
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Mine is missing the ring on the passenger side inside. Plus my driver's side must be out, becuase it's consistently getting worse, slowly but surely. Whenever I drive dead straight, or do a left turn, I have a rubbing noise. It was diagnosed as the passenger side, so I got that replaced, and it did nothing. So I'm assuming it was the driver side this whole time....
I'm really not sure, because there's a TSB from Ford that notes "a rubbing noise similar to a bad wheel bearing" or something like that. From what I found, it didn't list a fix, just that they knew about it.
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Joined: Oct 2003
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CEG\'er
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CEG\'er
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Mine sounds horrible. It is now starting to make a pop noise. The last time it started popping it locked up, AAAAAAAAAHHHHHHHHH 
1996 Sport LX Desert Violet Pearl(purple)
2.5 liter V-6
Name:(Grape)
Finally Fixed
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