Tests And Test Requirements
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
The following checks will be helpful when performing Fault Finding in case of complaints regarding the brake booster or the so-called >>hard brake pedal<<.
The following components are included in the check:
- Brake Booster
- Gasket between the brake master cylinder and the brake booster
- Check Valve
- Vacuum hoses with connectors
- Vacuum pump (if equipped)
NOTE:
Keep the geographical surrounding in mind when evaluating the measurement results. The higher above sea level, the lower the air pressure.
Note the test requirements:
- Visually inspect all of the vacuum hoses for damage (for example, tears or damage caused by animals) and secure fit
- Clean the engine compartment before starting work, if necessary
- Maintain clean working conditions when working on the vacuum system