A4623432069904_1

Technical Service Bulletin
46 Noises when braking - All models
46 23 43 2069904/1 April 18, 2023.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All Audi Models
2000 – 2024
All
Not Applicable
Condition
Customer states:
Noises when braking.
Workshop findings:
Noises are generated at the front and/or rear brakes when braking.
The brake pad thickness is OK and there is no further TSB on this topic.
Technical Background
There are different causes related to brake noises.
They are often related to contamination with brake dust, rust, road grit, or other external influences.
These noises are more likely to occur due to low mileage, only driving short distances, and very light braking
application which does not enable cleaning of the brake to be performed sufficiently or optimum friction to be built
up on the friction faces.
On new vehicles and low-mileage vehicles, noises may also occur as the friction faces must first bed in properly
in relation to each other in order to generate an optimum friction value. It is difficult to determine a specific
mileage that is required to do this, as this depends heavily on the driving profile.
Glazed friction surfaces on the brake pads also lead to noises. This phenomenon indicates a strong or excessive
thermal load.
Page 1 of 4
© 2023 Audi of America, Inc.
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 a dirty friction surface on the brake pad.
Page 2 of 4
© 2023 Audi of America, Inc.
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 2: Example of a dirty friction surface on the brake disc.
Figure 3: Example of brake pads with glazed friction surface.
Production Solution
Not Applicable
Service
Page 3 of 4
© 2023 Audi of America, Inc.
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
It is important that the brakes are bedded in adequately using a driving style suited to the traffic conditions, and
that they are braked clean at regular intervals. There is also information on this topic in the Owner's Manual. It
may be advisable to inform the customer about this.
In the event of glazed or very dirty friction surfaces on the pads, the friction surface can be worked on/cleaned
using workshop materials (e.g. Sandpaper; Brake cleaning) and the brake should then be bedded in again.
It is not necessary to replace parts.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All part and service references provided in this TSB (2069904) 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
these materials be modified or reposted to other sites, without the prior expressed written permission of the
publisher.
Page 4 of 4
© 2023 Audi of America, Inc.
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.