# Service bulletin A4521232065341\_1

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10204726
- Published by NHTSA: 2022\-01\-05
- Manufacturer's number: A4521232065341\_1
- Manufacturer's date: 2021\-12\-13
- NHTSA component: SERVICE BRAKES

## NHTSA's summary

This informational bulletin states that the surface cracking is due to special layering processing of the tungesten carbide. The temperature and the different expansion rates between steel and tungesten cause the cracking.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204726-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10204726-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes

## Vehicles listed

- 2023 AUDI E\-TRON
- 2022 AUDI E\-TRON GT
- 2022 to 2023 AUDI RS E\-TRON GT

## Recalls for the same vehicles and component

- [2026187](/recalls/tc/2026187.md), 2026-04-15: Brakes
- [26V240000](/recalls/nhtsa/26V240000.md), 2026-04-15: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
- [24V465000](/recalls/nhtsa/24V465000.md), 2024-06-20: SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS
- [2024355](/recalls/tc/2024355.md), 2024-06-19: Brakes

## Other bulletins for the same vehicles and component

- [TSB\_2077435\_3](/bulletins/11036924.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information when there are cracks on the friction ring surface on ceramic brake discs.
- [TSB\_2075120\_3](/bulletins/11036921.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information about the general approach for brake vibration concerns.
- [TSB\_2072304\_4](/bulletins/11036914.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information when there is an ABS/ESC speed sensor implausible signal.
- [TSB\_2069904\_3](/bulletins/11036911.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information for all models regarding brake sounds.
- [TSB\_2069078\_4](/bulletins/11036909.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information on the zirconium insercts in the brake piston \(ceramic brakes only\).
- [TSB\_2067132\_4](/bulletins/11036906.md), 2026-09-04, Service bulletin: SERVICE BRAKES. This bulletin provides information when there is corrosion on the friction survace of steel brake discs.
- [TSB\_2034143\_11](/bulletins/11027374.md), 2026-01-07, Service bulletin: SERVICE BRAKES. This Repair Authorization requests that technicians contact the Technical Assistance Center before proceeding with any brake repairs on vehicles with Cceramic brakes.
- [TSB\_2077435\_2](/bulletins/11025404.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information when there are cracks on the friction ring surface on ceramic brake discs.
- [TSB\_2069904\_2](/bulletins/11025369.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information for all models regarding brake sounds.
- [TSB\_2063679\_6](/bulletins/11025367.md), 2025-11-08, Service bulletin: SERVICE BRAKES. This bulletin provides information when the DTC C1399F0 is stored in the ABS control module.

JSON: [/v1/bulletins/10204726](/v1/bulletins/10204726)

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