Technical Service Bulletin
47 Hard brake pedal while attempting to start the vehicle
47 22 12 2055646/3 June 9, 2022. Supersedes Technical Service Bulletin Group 47 number 21-08 dated February 25,
2021, for reasons listed below.

Model(s)

Year

VIN Range

Vehicle-Specific Equipment

Page 1 of 6
© 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
A4 allroad, A4,
and Q7

2017 - 2021

A4, A5, A5
Cabriolet, A5
Sportback, S5, S5
Cabriolet, S5

2018 – 2021

Sportback, Q5,
an SQ5

RS 5

A6, A7, and Q8

2018 – 2019
2020 – 2021
2019 – 2021

All

Not Applicable

2019

RS 5 Sportback

2021

A6 allroad, S6,
S7, Q5 e quattro,

2020 – 2021

SQ7, SQ8, RS Q8
RS 6 Avant, A8 e
quattro, RS 7, Q5
Sportback, and

2021

SQ5 Sportback

Condition
Page 2 of 6
© 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
REVISION HISTORY
Revision

Date

Purpose

3

-

Revised Warranty (Updated table)

2

02/18/2021

Revised title
Revised header (Added models)
Revised Service (Added Elsa location)
Revised Additional Information (Added reference)

1

07/17/2019

Initial publication

Customer states:
• After a short stationary period, the vehicle sporadically does not start and there is a hard brake pedal concern.

Technical Background
Due to dirt particles in the non-return valve in the vacuum hose for the brake servo, the vacuum in the brake servo
cannot be held on a parked vehicle.
When starting the vehicle the usual brake force is not enough to get the start authorization of the brake light
switch.
Normally, a vacuum of 600 to 950 mbar is reached.
Depending on the parking position (slope) or the user behavior the vehicle is parked with a small vacuum within 12
hours the vacuum may drop by up to 400 mbar.

Production Solution
Page 3 of 6
© 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
Not applicable.

Service
Replace the “vacuum hose with non-return valve and pressure sensor – G608” according to the Elsa Repair Manual,

Elsa >> Brake System >> 47 Hydraulic Components >> Vacuum System.

Warranty
Claim Type:

• 110 up to 48 Months/50,000 Miles.
• G10 for CPO Covered Vehicles – Verify Owner.
• If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only.

Service Number:

4777

Damage Code:

0010

Labor Operations:

Vacuum hose remove + reinstall

4777 1950

See SRT with
associated
operations

Brace remove + reinstall (Only if installed in the

4086 1999

50 TU

6644 19XX

See SRT with

vehicle)
Cowl panel trim remove + reinstall

associated
operations

Page 4 of 6
© 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
Diagnostic Time:

Claim Comment:

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

As per TSB 2055646/3

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.

Required Parts and Tools
Always check with your Parts Department and/or ETKA for the latest information and parts bulletins.
Part Number

Part Description

Quantity

See ETKA

Vacuum hose with non-return valve and pressure sensor

01

See ETKA

Fasteners, Bolts, Nuts, and Screws as needed per the

See ETKA/ELSA

Repair Manual

Additional Information
More information on this system can be found in the following resources:
• Elsa: Brake System >> 47 Hydraulic Components >> Vacuum System.
All parts and service references provided in this TSB (2055646) are subject to change and/or removal.
©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

Page 5 of 6
© 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
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 6 of 6
© 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.