Brake Booster Tester, Connecting

WARNING: This page is about a different car, the 2024 Audi SQ7, 2024 Audi Q7, 2023 Audi SQ7, and 2023 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Procedure

-- Remove the vacuum hose from the brake booster.

TIP:

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

-- Connect the Brake Servo Tester:VAS6721 .

Fig 1: Connecting Brake Booster VAS6721

Courtesy of AUDI

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 Brake Servo Tester:VAS6721 makes it easier to remove Open to simulate a malfunction source Connect the Hand Vacuum Pump:VAS6213 .
C	Shut-off valve	In the direction toward the brake booster

-- Connect the hose -A- from the Brake Servo Tester: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