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Home >> Audi >> 2021 >> S4 Prestige >> Repair and Diagnosis >> Engine Performance >> Ignition System >> General, Technical Data (Brake System) >> 00 General, Technical Data >> Brake Inspection >> General Information
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General Information

Vehicles with Vacuum Brake Booster:

Brake control systems are inoperative when the ignition is switched off.

Vehicles with Electric Brake Booster (eBKV):

With the ignition out the brake control system is functional for some time.