Check Valve, Removing And Installing: Notes
WARNING: This page is about a different car, the 2016 Audi A3 and 2015 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Clean the bolts and nuts before reusing.
Always replace self-locking nuts and bolts.
Always replace damaged nuts and bolts.
NOTE:
The check valve is integrated in the vacuum hose and cannot be replaced separately.