Haynes does not say what size and there are 2 systems used between '95 and
1. The ATE/Teves system uses an Allen Bolt so the wrench is most probably
metric (German) As for the size I'm guessing it will be between 1mm and
2. The Lucas system uses a bolt so again metric with the same guess as 1.
Yes, 7 mm is used on my 2001 A4 Avant as well (ATE/Teves), this being
the very last B5 - old chassis - model. 7mm is available as an Allen key
socket on 1/2 inch drive.
<OT> for completeness' sake it can be mentioned that the A4 *sedan* of
same year uses the B6 chassis) </OT>
The slide pins for the back brakes on the same car are removed via the
use of two crescent wrenches, one is 13mm, can't remember the size for
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