Brake Booster Tester, Connecting

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Brake Servo Tester :VAS6721
Hand Vacuum Pump :VAS6213

-- Remove the vacuum hose from the brake booster.

NOTE:

Pressing the brake pedal a few times beforehand makes it easier to remove the vacuum hose.

-- Connect the :VAS6721 .

Fig 1: Connecting Brake Booster VAS6721

Courtesy of AUDI OF AMERICA, LLC

Item	Component	Explanation
A	Shut-off valve	In the direction toward the vacuum hose, the check valve and vacuum pump (if equipped)
B	Shut-off valve	Opening the :VAS6721 makes it easier to remove Open to simulate a malfunction source Connect the :VAS6213 .
C	Shut-off valve	In the direction toward the brake booster

-- Connect the hose -A- from the :VAS6721 to the vacuum hose and push the adapter -C- into the brake booster.

Fig 2: Connect The - VAS 6721- Hose -A- Too The Vacuum Hose And Push The Adapter -C- Into The Brake Booster.

Courtesy of AUDI OF AMERICA, LLC