Check Valve, Checking

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.

-- Remove the check valve. Refer to CHECK VALVE, REMOVING AND INSTALLING .

The valve must allow air to flow in the direction of the arrow.
The valve must remain closed in the opposite direction.

-- Install the check valve. Refer to CHECK VALVE, REMOVING AND INSTALLING .

NOTE:

Note the flow direction: the arrow symbol faces the vacuum pump.