Each hub sits on a ball joint, secured by 2 bolts to the hub and 1 nut to the lower arm, this is the case on each corner.
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With a completey knackered ball joint you will be able to find some
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"play" in the joint by leavering the hub and lower arm apart with a leaver bar.
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If you push your finger into the rubber boot part of the ball joint and leaver the hub and lower arm apart you will feel some
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"play"
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Where a ball joint is worn but not excessive you will not feel anything, this does not mean its ok.
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On a 2 poster ramp or by jacking the car up the suspension pushes the hub into a un-natural road going position which pushes the ball joint together and making it harder to find
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"play"
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A good ball joint will be very difficult to rotate by hand
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(if it were in you hand) so if your not sure get it out and check it.
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You have to image that with the cas weight sitting on the ball joint there would be very much more
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"play"
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Alot of poor driving
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"feel" is created by ageing ball joints and often over looked because its can be difficult to diagnose.
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The other possibility will be the wheel bearings/discs/track rod ends and even top mounts which are very much easier to check, let us know if you not sure.
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James