A4622282051095_5

Technical Service Bulletin
46 Audi frequency analysis
46 22 28 2051095/5 February 22, 2022. Supersedes Technical Service Bulletin Group 46 number 21-22 dated
February 10, 2021 for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All
2010 – 2023
All
Not Applicble
Condition
REVISION HISTORY
Revision
Date
Purpose
5
-
Revised header (Added model year)
4
02/10/2021
Revised header (Added model year)
3
03/14/2019
Revised header (Added model year)
Revised Service (Added Step 12)
This bulletin is informational only and can help technicians to identify noise frequency for specific concerns
related to the brake system, especially brake squeal.
Technical Background
Brake squeal is the most common brake noise concern received from customers. This bulletin will help you to
identify the correct frequency for the concern.
Knowing the exact frequency can help Audi of America to understand the issue and find a feasible solution
(for example new pad materials, new pad geometry, new backing plate, new spring design, balance weight,
etc.).
Remember that brake squeal is a normal result of multiple factors acting on the brake system.
Brake squeal is not a defect.
Production Solution
© 2022 Audi of America, Inc.
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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
Not applicable.
Service
Download the Audi Frequency Analysis App according to the instructions below:
1. Go to Audi B2B App Shop at https://b2bappshop.audi.de.
2. Sign in with your Global (GeKo) User-ID and Password.
3. Click on “Sign In” (Figure 1).
4. Select the type of device: iOS or Android (Figure 2).
© 2022 Audi of America, Inc.
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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. Sign in screen.
Figure 2. Select the type of device.
5. Click on “Install” to start downloading the App (Figure 3).
6. Example of the downloaded App in an iPhone (Figure 4).
© 2022 Audi of America, Inc.
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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 3. Installing the APP.
Figure 4. Example of the downloaded app and app
shop.
© 2022 Audi of America, Inc.
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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
If you receive the following iPhone error message
(Figure 5) “Untrusted Enterprise Developer” after
clicking on the app then follow the Tip below. Skip
to next figure for Android.
Tip: Go to: Phone Settings >> General >>
Profiles & Device Management >> Enterprise
APP>>Audi AG >> Trust Audi AG.
Figure 5. Error message “Untrusted Enterprise
Developer”.
© 2022 Audi of America, Inc.
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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
If you receive the following Android error message
(Figure 6): “This type of file can harm your device.
Do you want to keep Waveform-release-1.9-sign.apk
anyway?”
Tip: Select “OK” and proceed with the
installation process.
Figure 6. Error message for Android Phone.
7. After opening the app, see the following example of the main screen (Figure 7).
8. To start frequency analysis, select “Record” (Aufnehmen). There are other functions also available: Play
(Abspielen), Cut (Schneiden), and Export (Exportieren) (Figure 8).
© 2022 Audi of America, Inc.
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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 7. Example of the main screen.
9.
Figure 8. To start the analysis, select Aufnehmen.
You will be able to record the brake squeal from inside or outside the vehicle, depending on
conditions.
10.
Example of a typical brake squeal at 1,6 KHz. The red scale can be moved to identify the main
frequency causing the squeal. Be aware that there are a lot of surrounding noises that can disguise
the main frequency focus (Figure 9).
11.
Example of a typical brake squeal at 3,2 KHz. Also at the top right the date is recorded, exact
frequency, and level of noise in dB (Figure 10).
© 2022 Audi of America, Inc.
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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 9. Other sounds can disguise the main
frequency.
Figure 10. Typical brake squeal frequency recording.
12 To create an audio file from the frequency app for attachment to a TAC case, follow the steps below
.
(Figures 11 - 13).
© 2022 Audi of America, Inc.
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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 12. Select the desired audio file.
Figure 11. Take a clear sound recording and then
select the “More” icon.
© 2022 Audi of America, Inc.
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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 13. Then select “Exportieren (Export)” and
send the file to the source used to attach the
document to a TAC case.
Warranty
This TSB is informational only and not applicable to any Audi Warranty.
© 2022 Audi of America, Inc.
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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
Additional Information
All parts and service references provided in this TSB (2051095) 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.
©2022 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.
© 2022 Audi of America, Inc.
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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.