2022-2023 Audi e-tron GT Brake Pedal Vibration TSB

Symptoms

Owners of 2022-2023 Audi e-tron GT vehicles may notice a specific issue during braking. The primary complaint is that "a vibration/pulsation is felt at the brake pedal, and/or the brake pedal feels 'different'" when braking at low speeds. This unusual sensation, which can be consistently reproduced, points to a potential problem with the brake system.

Fault Codes / DTCs

When diagnosing the issue, technicians may find a specific Diagnostic Trouble Code (DTC) stored in the ABS/ESC Control Module, identified as J104 (address word 0003). The relevant fault code is:

• DTC P05FF00 – Brake pressure sensor / Sensor for brake pedal travel deviation.

This DTC directly points to a potential problem with the brake pressure sensor or its related travel deviation sensing, contributing to the observed Audi e-tron GT brake pedal vibration.

Diagnosis and Trigger Conditions

Before proceeding with repairs, technicians are instructed to confirm the complaint can be reproduced. The diagnostic process involves reading the measured value for "Adaption value offset wheel brake stiffness" and uploading this log to the GFF Paperless system. This step helps in identifying the root cause of the Audi e-tron GT brake pedal vibration.

Repair Procedure Summary

Audi Technical Service Bulletin 2068205/1, issued on October 10, 2022, outlines a specific procedure to address the brake pedal vibration and associated DTC P05FF00. The repair focuses on properly bleeding the brake system.

1. Initial Data Collection: Read out the measured value for "Adaption value offset wheel brake stiffness" and upload the corresponding log to GFF Paperless. This ensures that baseline data is recorded before any repairs begin.
2. Clear Fault Codes: Clear any Diagnostic Trouble Codes (DTCs) currently stored in the J104 ABS/ESC control unit. This prepares the system for the repair and helps confirm if the issue is resolved afterward.
3. Brake System Bleeding: Fully bleed the brake system. This critical step must be performed according to the detailed instructions found in the ELSA workshop manual under the path: Chassis >> Brake System >> 47 Hydraulic Components >> Hydraulic System >> Bleeding.
4. Re-evaluation: After bleeding, re-evaluate the vehicle to confirm improvements in brake pedal feel and the absence of any noise. If the issue is resolved, the vehicle can be released. If the Audi e-tron GT brake pedal vibration persists, the entire brake system bleed procedure should be repeated.

Important Notes for Owners

Audi indicates that a