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.

-- 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 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 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 OF AMERICA, LLC