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OK, I think I did misinterpret. But on rereading r lane's post, it looks like he's not asking about lifting a tire but rather why the rear is rising under braking? I don't see a lifting tire in that pic. The car is also leaning a fair bit.
So that's two different things going on. Butt in the air could be not enough anti-dive in the front and/or not enough anti-squat geometry in the rear (which can impact lifting under hard braking). Porsche addressed both on the early RSR and on the 930 by revising the suspension geometry.
Lateral leaning of course can be solved with more swaybar and/or heavier springs / torsion bars.
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