Specified Values
WARNING: This page is about a different car, the 2015 Volkswagen Passat, 2014 Volkswagen Passat, 2013 Volkswagen Passat, and 2012 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
High-pressure side:
Increasing from pressure with engine not running to a maximum of 20 bar.
Low-pressure side:
Decreasing from pressure with engine not running down to 1.3 bar.