Check Valve: Removing
WARNING: This page does not describe the selected car, but rather 23 other vehicles, including the 2017 Audi S5, 2017 Audi A5 Quattro, 2016 Audi S5, 2016 Audi A5 Quattro, and 2015 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.
-- Open the clamp on the vacuum hose with pliers.
-- Disconnect the vacuum hose from the pump.
CAUTION:
Be careful not to bend or damage the vacuum hose. Replace the vacuum hose if damaged.
-- Remove the vacuum hose on the left and right of the check valve -4-.
-- Remove the check valve from the vehicle.