audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Vacuum Pump, Brakes|Testing and Inspection > < Brake Booster/Brake Master Cylinder, Assembly Overview|Page 8501
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Vacuum Pump: Description and Operation

Electric vacuum pump 

Description and function 
The electric vacuum pump is only installed in vehicles with automatic transmission. It is switched on by Engine Control Module (ECM) depending on
intake manifold pressure.
The vacuum pump is On Board Diagnostic (OBD) capable. Detected malfunctions are stored in Engine Control Module (ECM).
Testing function of electric vacuum pump via On Board Diagnostic (OBD) must only be performed with engine at standstill!

Vacuum Pump, Brakes|Testing and Inspection > < Brake Booster/Brake Master Cylinder, Assembly Overview|Page 8501