D2 A8/S8 (1997 - 2003)
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Posted by: BrianC72gt (5512) on 2017-12-27 11:51:22
In Reply to: Additonal question: Having HP2 calipers does not enable me to make the drop-on install? posted by Mortem76 on 2017-12-26 08:32:26

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Here is what I know, albeit imperfectly. The A8 facelift upright is alloy, pre facelift is steel. D3 calipers will bolt right up to Facelift Alloy uprights. The mounting bracket from the D3 calipers does not line up with the steel upright. I don't know squat about your HP2 calipers, or if the HP2 bracket will allow you to attach D3 calipers to attach to them.

The lower arm ball joints for alloy uprights have a larger diameter stub on the ball end, and a hardened steel insert in the upright, to spread the load. The straight arm is definitely a different diameter. I'm not sure about the lower curved arm.
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