Tests And Test Requirements

Special tools and workshop equipment required 

• Brake Servo Tester:VAS6721 

The following checks will be helpful when performing fault finding if there are 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)

Keep the geographical surrounding in mind when evaluating the measurement results. The higher above sea level, the lower the air pressure.

Always observe all test requirements before checking the vacuum system:

• Visually inspect all of the vacuum hoses for damage (for example, tears or damage caused by animals) and secure fit
• Maintain clean working conditions when working on the vacuum system
• Clean the engine compartment before starting work, if necessary