Recall 21V707 affects 38 2021 Audi E-Tron vehicles for brake-booster corrosion that can disable brake assist, ABS, and ESC. Free repair at any franchised Audi dealer.
Audi is recalling 38 2021 E-Tron vehicles because corrosion in the brake booster can make the ABS, electronic stability control, speedometer display, and brake assist stop functioning. Loss of braking assist, ABS, and ESC increases stopping effort and distance and increases crash risk; Audi dealers will complete the repair free of charge.
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What's wrong?
The integrated brake system on the 2021 Audi E-Tron uses an electromechanical brake booster to add power assist when you press the pedal. That booster helps build braking force and also supports systems tied into braking, including ABS, Electronic Stability Control, the speedometer display, and brake assist.
In affected vehicles, a small electronic part inside the booster, the FlexRay transceiver, was built with wafers that missed required cleaning steps during supplier production. Those contaminated parts can corrode inside the booster. Corrosion can create short circuits or interruptions, which can make ABS, stability control, the speedometer display, and brake assist stop working.
If the brake booster fails, the vehicle is supposed to show a warning message in the instrument cluster. Treat that message as the warning sign. Contact an Audi dealer without delay and arrange diagnosis and repair.
Who's affected?
Both component categories point to the same integrated brake system and brake booster.
| 2021 Audi E-Tron | hydraulic brake system |
|---|---|
| 2021 Audi E-Tron | hydraulic brake system |
| Units affected | 38 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific SUV is included.
What's the safety risk?
A loss of braking assist, ABS, and ESC increases pedal effort and stopping distance, and raises crash risk. If a warning message appears in the instrument cluster, contact an authorized Audi dealer without delay and arrange diagnosis before further driving. Repair is free at any franchised Audi dealer.
What should I do?
- Check your VIN to confirm your 2021 Audi E-Tron is included in this recall.
- Contact a franchised Audi dealer to schedule the free brake-booster replacement, which fixes corrosion that can disable brake assist, ABS, ESC, and the speedometer display.
- Bring the recall notice if Audi sent one, and reference recall number 21V707 when you call.
- Drive cautiously until the repair is complete. Leave extra stopping distance and avoid hard braking.
What happens at the repair
At the dealer, an Audi technician replaces the brake booster covered by the recall. The brake booster helps apply braking force, and replacing it addresses the corrosion problem in the booster. Parts and labor are covered under the recall. Out-of-pocket repairs already paid are handled through Audi's New Vehicle Limited Warranty, not through a separate reimbursement program. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| September 13, 2021 | NHTSA published the recall |
|---|---|
| September 30, 2021 | Owner notification mailed |
| November 12, 2021 | Dealer notification began |
| November 12, 2021 | Dealer notification ended |
| November 12, 2021 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 21V707?
Recall 21V707 covers 38 2021 Audi E-Tron vehicles with brake booster corrosion that can cause the ABS, ESC, speedometer display, and brake assist to stop functioning. Audi dealers will replace the brake booster free of charge.
What should I do if my 2021 Audi E-Tron is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 21V707. If it is, contact a franchised Audi dealer to schedule the brake booster replacement. Reference recall 21V707 and Audi recall number 47R7 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and Audi will replace the brake booster free of charge at any franchised Audi dealer. Parts and labor are covered.
What is the safety risk in recall 21V707?
The safety risk is reduced braking support. In recall 21V707, a loss of braking assist, ABS, and ESC will increase the effort and distance required to stop, increasing crash risk. The free dealer repair replaces the brake booster.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V707000 |
|---|---|
| Audi customer service | 1-800-253-2834 |
| NHTSA recall # | 21V707 |
| NHTSA recall # (full) | 21V707000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →