Guidelines For Clean Working Conditions

WARNING: This page is about a different car, the 2022 Audi Q3. However, it is still accessible from the selected car via links, so may be relevant.

The highest level of cleanliness is required when working on the brake system. Using any products which contain mineral oil such as oils, greases etc. is strictly prohibited.
Thoroughly clean all connection points and their surrounding areas before loosening. However, do not use aggressive cleaning agents such as brake cleaner, gasoline, thinners or similar compounds.
Place the removed parts on a clean surface and cover them.
Carefully cover or seal opened components if the repair is not performed immediately. (Use the plugs from the Repair Kit: 1H0 698 311 A or the Assembly Part Set: 5Q0 698 311 ).
Only use lint-free cloths
Remove the replacement parts from their packaging just prior to installing them.
Only use parts in their original packaging.
If the system is open, do not work with compressed air and do not move the vehicle.
Make sure that brake fluid cannot get into the connectors.