It's something I've gotten used to doing in GT4 in many cars to improve my times by eliminating understeer on turn-in, and yet I can't easily explain it. I do it so subconsciously that I don't even know the sequence of inputs, but it's a specific way of combining braking with alternating quick steering inputs and no steering. I would need to try it while consciously thinking about it to know for sure, but I think it involves steering slightly right before braking (or perhaps braking and then immediately steering slightly?
) and then not steering until you get closer to the corner. I hope that makes sense. 
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