Tests And Test Requirements
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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