A462230203418120

Technical Service Bulletin
46 Brake noise analysis and handling
46 22 30 2034181/20 April 7, 2022. Supersedes Technical Service Bulletin Group 46 number 22-27 dated
January 31, 2022, for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
All
2012 – 2023
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
20
-
Revised Warranty (Updated Claim Type)
19
-
Revised header (Added model year)
18
2/10/2021
Revised header (Added model years)
Customer states:
• They hear a brake noise from the front or rear brakes. The customer may describe these noises as a squeal,
squeak, grinding, groaning, thumping, or creaking.
Note:
DO NOT use this TSB if there is another brake noise TSB applicable to the VIN.
For additional information, refer to the Audi Brake systems brochure.
Technical Background
Brake noise can be attributed to many causes. The most common causes are:
1. Brake discs or brake pads are close to or below their wear limit.
2. New brake pads and/or discs have not been properly embedded after installation.
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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
3. Aftermarket pads or discs are installed.
4. There is debris (such as small stones, grit, road salt, or sand) between the brake disc and brake pad.
5. Discs are covered with rust. Rust can form
when the vehicle has not been driven for a
long period of time (Figure 1).
Figure 1. Disc covered with rust.
Page 2 of 10
© 2022 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
6. Discs are grooved (Figure 2).
Figure 2. Grooved disc.
7. There is chemical contamination on the braking
surface of the brake disc due to wheel or tire
cleaner being sprayed directly onto the brake
disc (Figure 3 and Figure 4).
Figure 3. Discoloration on the brake disc due to chemical
contamination from the cleaner that was sprayed directly
onto the disc.
Page 3 of 10
© 2022 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 4. Small spots and discoloration due to chemical
contamination from the cleaner that was sprayed directly
onto the disc.
8. There are “pad marks” on the brake disc as a
result of brake pad material transferring to the
discs (Figure 5). Pad marks can occur when a
vehicle has been parked for long periods of
time in a wet or snowy environment.
Figure 5. Brake pad material has transferred to the discs.
Note:
For specific pulsation concerns, refer to TSB 2022584: 46 Brake pulsation diagnostic guidelines.
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© 2022 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
For specific frequency analysis, refer to TSB 2051095: 46 Audi frequency analysis.
Production Solution
Not applicable.
Service
Proceed as follows:
1. Check the overall condition of the brakes to determine if the brake noise is caused by one of the causes listed
in the Technical Background section of this bulletin. If the noise is not a result of one of these causes, proceed
with the following steps 2-4.
2. Determine the location of the brake noise (e.g., left front, front axle, rear axle, etc.):
• Knowing the location of the noise on the vehicle is critical to properly addressing the concern.
• It may be necessary to have an assistant listening from inside or outside of the vehicle to accurately
determine the location.
3. Obtain a sound or video recording and fill out the questionnaire:
• The sound recording should be from a cell phone using the Audi analysis app (TSB 2051095: 46 Audi
frequency analysis) and the noise should be clearly identified.
• Recordings submitted by customers are also acceptable.
• In order to minimize file size, only sound recordings are necessary. Videos should only be sent if it is critical
for understanding the conditions under which the noise occurs.
• Fill out as much information as possible in the questionnaire. Some fields are mandatory.
4. Clean the brake pads and discs:
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© 2022 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
A) With careful consideration of the traffic
situation, perform up to 5 ABS stops from speeds
above 50 mph. Between each ABS stop, allow the
brake components to cool by driving the vehicle
for more than one minute at speeds greater than
50 mph.
B) Let the vehicle sit for two hours to cool down.
C) Test drive again.
If the noise was not eliminated after completing
steps A and B, open a Technical Assistance Center
(TAC) ticket and include the following information
with the TAC ticket:
• Completed Brakes Acoustic Questionnaire.
• Sound or video recording (sound recording
preferred from Audi frequency app, see TSB
2051095: Audi frequency analysis).
• Frequency analysis (screenshot preferred
showing peak frequency, see figure 6).
Figure 6. Example of a frequency analysis screenshot.
Page 6 of 10
© 2022 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
• Photos of the affected brake discs and pads
that clearly show the condition of the braking
surface (see Figures 7 through 11).
Figure 7. Example of the whole disc.
Figure 8. Example of brake system equipped guide pins
(showing all 4 guide pins).
Figure 9 and 10. Example of Inner and outer with an adhesive pad.
Page 7 of 10
© 2022 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 11. Example of pads without adhesive (mark position for reinstallation if not replaced).
5. Known brake noise frequency and repair suggestions:
Note:
The information below is only a reference for vehicles with a similar brake system, always review the specific
VIN for applicable TSBs. Review ELSA Repair Manual for specific brake system repair information.
Brake system ATE-TEVES with PR codes: 1LF/1LG/1LL/1ZK/1LJ/1LP:
A) 1.6 KHz from front brakes. Inspect front pads.
B) 3.2 KHz/11 KHz from front brakes. Inspect front discs and pads.
Brake system TRW with PR codes : 1LA/1LB/1LD/1LT/1ZT/1LJ:
A) 1.6 KHz to 1.7 KHz from front brakes. Inspect front discs.
B) 3.2 KHz from front brakes. Inspect and if needed, suggest to clean and lube the guide pins in the caliper
carrier using anti-seize paste G052560A2.
C) 7.8 KHz from front brakes. Inspect front pads.
Warranty
Claim Type:
• 110 up to 12 Months/12,000 Miles.
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© 2022 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
• If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only.
Service Number:
4617
Damage Code:
0020
Labor Operations:
Clean brake pads and discs
4617 8099
70 TU
GFF
No allowance
0 TU
Road test prior to the service procedure
No allowance
0 TU
Road test after the service procedure
No allowance
0 TU
Includes: Road tests, submission of an audio file,
and questionnaire
Diagnostic Time:
Claim Comment:
As per TSB 2034181/20
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.
Additional Information
The following Technical Service Bulletin(s) may be necessary to complete this procedure:
• TSB 2022584: 46 Brake pulsation diagnostic guidelines.
• TSB 2051095: 46 Audi frequency analysis.
All parts and service references provided in this TSB (2034181) 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
Page 9 of 10
© 2022 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
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 10 of 10
© 2022 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.