A4621252054385_2

46 Brakes creak at an almost standstill
46 21 25 2054385/2 February 25, 2021. Supersedes Technical Service Bulletin Group 46 number 19-09 dated
March 21, 2019 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All
2007 - 2023
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
2
-
Revised header (Added model years)
1
03/21/2019
Initial publication
Customer states:
 Creaking noises when braking at almost standstill
(crawling when pulling away or briefly before
standstill).
 Please review the audio/video example: https://audiexternal.kzoplatform.com:443/#/player/medium/1376
799528052593748?autoplay=on&embed=true
(Figure 1).
Figure 1. QR Code for supporting video.
Technical Background
Page 1 of 3
© 2021 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.
Brakes creak through the stick-slip effect:
 The stick-slip effect describes an undesired, jerky, and pulsating slip (transition from static to dynamic friction)
of two objects moving against each other.
 The stick-slip effect occurs if the static friction is clearly bigger than the dynamic friction. Example: when
driving very slowly and slightly operating the brakes.
 This effect occurs particularly often when lightly braking on vehicles with automatic gearbox at almost
standstill.
 The resulting vibrations are transmitted as vibrations via the suspension to the body where they are
converted to sound waves, such as creaking noises.
Note:
The stick-slip effect is more noticeable in vehicles with high-performance brakes, for example: SQ5, S4, S5, S6,
S7, or the e-tron, but it can be present in all vehicles.
Figure 2 graphically shows the stick-slip effect.
Figure 2. The stick-slip effect.
Production Solution
Not applicable.
Page 2 of 3
© 2021 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.
Service
Note:
The information below is a simplified explanation for Customers:
This creaking noise is a physical phenomenon (stick-slip effect), which in various intensity can also be reproduced
on other vehicles (normal condition) and does not reduce the braking performance.
Warranty
This TSB is informational only and not applicable to any Audi Warranty.
Additional Information
All parts and service references provided in this TSB (2054385) 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.
©2021 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 3 of 3
© 2021 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.