Check Valve, Checking

WARNING: This page is about a different car, the 2023 Volkswagen Atlas. However, it is still accessible from the selected car via links, so may be relevant.

Inspection Process

-- Carefully remove the check valve with the vacuum line -1- from the brake booster.

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Blow some air first in one then in the other direction through the check valve -1-.

The check valve -1- must allow air through in direction of -arrow-.
The check valve -1- must remain locked in the opposite direction of the direction of -arrow-. If this is not the case, replace the check valve or the complete vacuum line.

NOTE:

Pay attention when installing that the vacuum line with the check valve is on correct installation position on the brake booster.