Quattro Differentials?

[kilcoo316]

Just wondering, what types of differentials are in quattros?

Front - ??
Centre - mechanical limited slip diff??
Rear - ??

I assume the centre diff is limited slip of some form or other - but what about the other two - are they mechanical LSDs as well, or do they use the brakes to perform 'traction control' on each axle?

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[Scotty]

Vastly different depening of Haldex (transverse engines) and Torsen (longitudinal). I don't have a neat brief summary but if you do a Google on Haldex and Torsen there's loads of info.