47T9 – Brake Fluid Reservoir Cap – 2019-2021 Audi

August 25, 2023 NHTSA CAMPAIGN NUMBER: 23V601000

Incorrect Brake Fluid Cap

Incorrect brake fluid can reduce braking ability and increase the risk of a crash.


NHTSA Campaign Number: 23V601

Manufacturer Volkswagen Group of America, Inc.


Potential Number of Units Affected 7,499



Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Audi S7, S6 Sedan, RS7, RS6 Avant, A6 Allroad, 2019-2021 A7, and A6 Sedan vehicles. An incorrectly labeled brake fluid cap may have been installed, which can result in the use of the wrong type of brake fluid.



Dealers will inspect the brake fluid reservoir cap and, if necessary, replace it, free of charge. Owner notification letters are expected to be mailed October 17, 2023. Owners may contact Audi’s customer service at 1-800-253-2834. Volkswagen’s number for this recall is 47T9.



Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.


Check if your Audi has a Recall


Affected Vehicles

Country Beginning Model Year Ending Model Year Vehicle Vehicle Count
USA 2021 2021 A6 ALLROAD 267
USA 2019 2021 A6 SEDAN 4,681
USA 2019 2021 A7 1,571
USA 2021 2021 RS6 AVANT 376
USA 2021 2021 RS7 299
USA 2021 2021 S6 SEDAN 196
USA 2021 2021 S7 109


Problem Description

A small number of affected vehicles may be equipped with a European-specification brake fluid reservoir cap instead of the one required for the United States market. If the incorrect cap is present and the owner does not understand the markings, it is possible that the incorrect fluid could be used in the reservoir. Incorrect fluid can make the brake system perform improperly, causing the risk of a crash.


Corrective Action

Inspect and, if necessary, replace the brake fluid reservoir cap.


Code Visibility

On or about August 30, 2023 the campaign code was applied to affected vehicles.


Owner Notification

Owner notification will take place in September 2023. Owner letter examples are included in this bulletin for your reference.


Repair Overview

Inspect brake fluid reservoir cap and replace if necessary.


Repair Instruction



Chronology :

February 13, 2019: The Audi Product Safety Committee receives a report about the issue and the potential noncompliance.
Unsold vehicles will be checked and will receive a new brake fluid cap if necessary.

March 6, 2019: Topic presented to Audi Product Safety Committee. The committee decides to conduct a service campaign with customer notification.

March 20, 2019: After discussions with the responsible VWGoA colleagues from the United States market, the Audi Product Safety committee decides to file a petition for inconsequential noncompliance.

April 22, 2021: In vehicle production one vehicle is found that was built for the North-American market but was equipped with the brake fluid cap used for all other markets. Immediate investigation regarding root cause and affected vehicle scope commenced.

May 18, 2021: The responsible department determines that it cannot be ruled out that additional vehicles produced for North America have received a brake fluid cap with piktograms instead of verbal instructions.

Vehicles still in the factory and in the ports were checked and approximately 0.8% did not have the US specific brake fluid cap.

May – July 2021: Review of production data and determination of potentially affected vehicles.

July 19, 2021: The Audi Product Safety Committee determines that a non-compliance exists in the affected vehicles. Audi believes that there is no risk to vehicle motor safety and will file a petition for inconsequentiality (49 CFR part 556).

August 18, 2023: NHTSA informs VWGoA that they have denied the two petitions for inconsequential noncompliance.

Unrepaired vehicles that were previously reported under recall codes 47O8 and 47R2 are being moved into the following new code: 47T9


11 Affected Products


AUDI A6 2019-2021
AUDI A7 2019-2021
AUDI RS6 2021
AUDI RS7 2021
AUDI S6 2021
AUDI S7 2021


6 Associated Documents

Volkswagen – 47T9 Audi Dealer Advance Notice – August 2023

RCMN-23V601-0411.pdf 240.388KB



Recall Acknowledgement

RCAK-23V601-1009.pdf 646.426KB



Defect Notice 573 Report

RCLRPT-23V601-5026.PDF 219.348KB



Recall 573 Report – August 31, 2023

RCLRPT-23V601-9768.PDF 219.393KB



Remedy Instructions and TSB

RCRIT-23V601-4106.pdf 685.541KB



Volkswagen – 47T9 Audi Dealer Launch Notice – September 2023

RCMN-23V601-1056.pdf 223.427KB



Latest Recalls Documents

For the Latest and Most Recent Recalls Information Visit the link below…




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Last update on 2023-11-27 / Affiliate links / Images from Amazon Product Advertising API

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