Models With Horizontally Installed Engine
Tread depth difference on models with horizontally installed engine, such as A3, TT, Q3, A1...
Here the average difference between the front and rear axle must not be greater than 3 mm.
Average at front axle 2.0 mm
Average at rear axle 4 mm
Difference of front axle to rear axle 2 mm
Within the permissible tolerance of 3 mm