A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
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Disconnect connector - C - on the footwell vent.
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Remove footwell vents - A- and -B -.
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Remove brake lamp sensor => [ Brake Lamp Sensor ] See: Power Brake Assist/Brake Intervention Sensor / Switch/Service and Repair.
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First move brake pedal toward brake booster and hold it in this position.
