Loosen the left -6- and right -7- lines to the hydraulic control unit -1- one turn -arrows A- and remove them from the chambers -arrows B-.

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2015 Audi S6, 2015 Audi A6 Quattro, 2014 Audi S6, 2014 Audi A6 Quattro, and 2013 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.