A4623492067132_2

Technical Service Bulletin
46 Corrosion on friction surface of steel brake disc - All models
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
Not Applicable
All Audi Vehicles 2015 – 2025
Condition
REVISION HISTORY
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).
© 2023 Audi of America, Inc.
Page 1 of 3
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this
document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.
Technical Service Bulletin
Figure 1: Example of excessively rusted disc brakes. Figure 2: Example of rusted disc brake surface.
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.
©2023 Audi of America, Inc. All rights reserved. The information contained in this document is based on the
latest information available at the time of printing and is subject to the copyright and other intellectual property
rights of Audi of America, Inc., its affiliated companies, and its licensors. All rights are reserved to make changes
at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
© 2023 Audi of America, Inc.
Page 2 of 3
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this
document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.
Technical Service Bulletin
these materials be modified or reposted to other sites without the prior expressed written permission of the
publisher.
© 2023 Audi of America, Inc.
Page 3 of 3
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other
intellectual property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this
document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may
these materials be modified or reposted to other sites, without the prior expressed written permission of the publisher.