Vacuum System, Checking, RS 5: Procedure
WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2017 Audi S5, 2017 Audi A5 Quattro, 2016 Audi S5, 2016 Audi A5 Quattro, and 2015 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.
-- Turn off the ignition.
-- Press the brake pedal until there is no more brake assistance - "pump the brake booster empty". The brake pedal becomes hard.
-- Connect the Vehicle Diagnostic Tester to the 16-pin diagnostic socket in the vehicle with the ignition switched off.
-- Switch on tester -arrow-.
-- Turn on the ignition.
-- Start the appropriate program on the Vehicle Diagnostic Tester.
The ignition must be switched off and onto repeat the test.