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
• Seal between the master brake cylinder and the brake booster
• Check Valve
• Vacuum hoses and connectors
• Vacuum pump (if equipped)

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

Always observe all test requirements before checking the vacuum system:

• Check all the vacuum hoses for damage (for example, tears or damaged caused by animals) and make sure they are secure
• Maintain clean working conditions when working on the vacuum system
• Clean the engine compartment before starting, if necessary