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RE: A4 Electronic locking diffs...
For those who were asking, the owner's manual for the A4
explains that the locking diffs operate only at speeds
under 25mph, and work by applying brakes to the wheel
opposite that which is spinning.
I'm not sure how happy I am about this... seems to
me that EDL (Electronic Differential Lock) implies
something else, i.e. a differential that locks. The
end result is the same, I guess, except that this system
only works up to 25mph; above that, and you've got
open diffs front and back.
If the above is true then it sounds like the term EDL is nothing more than marketing BS and is technically inaccurate.