I come from a TC background so am happy to be told otherwise, however, the first thing I noticed when driving 2wd on a slippery surface was the unbalanced braking. All the 2wd cars I have driven have tended to pivot at the back when braking in a straight line. I guess the diff will work much the same way as it does under acceleration, when braking. One side is always going to have a slightly different level of grip to the other under braking therefore turning the back end as one wheel will be turning faster than the other. On high grip surfaces there's enough bite to stop the rear end from pivoting. That's my understanding of it anyway.
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