46 Corrosion On Friction Surface Of Steel Brake Disc - All Models (GROUP 46, NO. 23-49)
Reference number: GROUP 46, NO. 23-49
Supersedes refnos: 2067132/1, 2067132/2, GROUP 45, NO. 22-26
46 CORROSION ON FRICTION SURFACE OF STEEL BRAKE DISC - ALL MODELS
TECHNICAL SERVICE BULLETIN
| AUDI: | 2015-2025 All Audi Vehicles |
| GROUP: | 46 - Brake - Mechanical Components |
SERVICE INFORMATION
46 23 49 2067132/2 September 15, 2023. Supersedes Technical Service Bulletin Group 45 number 22-26 dated May 23, 2022, for reasons listed below.
| Model(s) | Year | VIN Range | Vehicle-Specific Equipment |
|---|---|---|---|
| All Audi Vehicles | 2015 - 2025 | All | Not Applicable |
CONDITION
| Revision | Date | Purpose |
|---|---|---|
| 2 | - | Revised header (Added Model Years) |
| 1 | 05/23/2022 | Initial publication |
Customer states:
- Rust layer on the brake disc.
AND/OR
- Noises and/or vibrations when braking.
Workshop findings:
- Workshop can confirm the complaint.
TECHNICAL BACKGROUND
- Corrosion on the friction surface can occur due to the effects of moisture and road salt, if the vehicle is stationary for long periods or if the brakes are only used lightly on short journeys (insufficient brake cleaning).(Figure 1 and 2).
- Also consider the following remarks:
- Brake discs are exposed to environmental influences such as water, salt, snow, and dirt.
- The brake disc material, flake graphite cast iron , is not resistant to corrosion.
- It is not possible to apply an anti-corrosion coating to the friction surfaces.
- The brake discs must be maintained according to the Owner's Manual (remove corrosion regularly, do not overuse by intensive braking).
PRODUCTION SOLUTION
Not applicable.
SERVICE
- Perform an extensive test drive with several brake operations.
- With careful consideration of the traffic situation, perform 2-3 ABS stops from speeds above 50mph. In between each stop, allow the brake components to cool by driving the vehicle for more than one minute at speeds greater than 50mph. Do not perform ABS stops if brand new pads and/or discs are installed.
- Check that the pads make contact with the disc correctly so that they are cleaning the entire surface of the brake disc.
- Replace brake disc and pads if the condition is not eliminated.
WARRANTY
This TSB is informational only and not applicable to any Audi Warranty.
ADDITIONAL INFORMATION
All parts and service references provided in this TSB (2067132 ) are subject to change and/or removal. Always check with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.
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