A4723232068205_4

Technical Service Bulletin
206847 Vibration/noise from brake pedal area - pedal feels different - DTC P05FF00
47 23 23 2068205/4 April 18, 2023. Supersedes Technical Service Bulletin Group 47 number 22-22 dated
December 19, 2022, for reasons listed below.
Model(s)
Year
VIN Range
Vehicle-Specific Equipment
e-tron GT, and
RS e-tron GT
2022 - 2024
All
Not Applicable
Condition
REVISION HISTORY
Revision
Date
Purpose
4
-
Revised Service & Technical Background (Revised Procedure)
Revised header (Added Model Year)
3
12/19/2022
Revised Service (Revised Procedure)
Revised Warranty (Revised Labor Operation)
2
11/08/2022
Revised Service (Revised Procedure)
Revised Parts and Tools (Added table)
Revised Warranty (Added Labor Operation)
Customer states:
• During braking at low speeds, a vibration/pulsation is felt at the brake pedal.
AND/OR
• The brake response feels “different”.
Workshop findings:
The following DTC may be stored in the ABS/ESC Control Module -J104- (address word 0003):
• DTC P05FF00 – Brake pressure sensor / Sensor for brake pedal travel deviation.
The complaint can be reproduced.
Technical Background
Information concerning e-tron GT Brake System.
Bedding-in routine not yet complete.
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
On new vehicles or after changing the brake pads, the new brakes must be bedded in. The vehicle performs this
procedure independently by briefly deactivating the recuperation function. Depending on the driving style, the
bedding-in routine may take up to 1000 miles.
“Brake refresh” function
This function helps to preserve the friction value of the brakes. After the vehicle has been stationary for an
extended period of time (+12 hours), braking energy of 500 kJ is applied to the mechanical brakes.
During this procedure, the recuperation function is deactivated briefly.
“Stiffness adaptation routine” function
During a regenerative braking (recuperation) procedure, the electric braking torque of the electric drive motors
needs to be exchanged for the hydraulic braking torque of the wheel brakes “blending” at least once, usually
shortly before the vehicle comes to a standstill.
To eliminate longitudinal braking fluctuations during “blending”, the control units involved (ABS/ESC control unit
and electromechanical brake servo) must be informed as precisely as possible of the actual stiffness of the brake
system.
For this purpose, a defined pressure value of the electromechanical brake servo is built up and then released
again with as small a gradient as possible. During this build-up and release of pressure, the ABS/ESC control unit
learns the current stiffness of the wheel brakes and stores the values. While the function is active, the brake pedal
moves approximately 1 in.
The brake lights are not activated in the process.
• The routine above is performed during every charging procedure.
• The adaptation procedure takes approx. 10 seconds.
• No adaptation procedure is accepted if the brakes are hot or the steering wheel is turned significantly out of
the center position.
• The adaptation procedure is only performed if the temperature of the brake discs is <100°C (212° F) and the
temperature of the brake calipers is <55°C (131° F).
• There is no minimum time interval between the adaptation procedures. The routine is initiated if the selector
lever is moved from P to D and back to P before charging.
Pedal travel is generally longer when maneuvering.
To improve brake modulation when parking, a smaller brake master cylinder is fitted on the e-tron GT compared
to the plug-in hybrid electric vehicles. This extends the pedal travel to ensure better modulation when parking and
maneuvering. In addition to this, both brake circuits are opened fully at speeds below 12 mph for reasons relating
to noise, vibrations, and comfort; this results in longer pedal travel.
Inferior friction value of ceramic brakes in wet and/or cold conditions compared to cast iron brakes.
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
This effect may occur if the vehicle switches from electric to hydraulic braking. This may result in the brake pedal
feel being different under braking although the same pressure is applied to the pedal.
Production Solution
Under analysis.
Service
Bedding-in routine not yet complete
The bedding-in routine must be completed. After it is completed, the relevant event memory entry is deleted
automatically from the ABS/ESC control unit.
For further details, refer to TSB 2063679.
“Brake refresh” function
The customer must be informed of the new function and vehicle characteristics.
Pedal travel is generally longer when maneuvering.
The technology has changed and the characteristics initially appear unusual. The customer must be informed of
the new functions and the corresponding vehicle characteristics.
Inferior friction value of ceramic brakes and tungsten carbide brakes in wet and/or cold conditions compared to
cast iron brakes
The customer must be informed of the differences between the brake systems and their characteristics in the
relevant weather conditions.
If necessary, the “Brakes” chapter of the Owner’s Manual can be used for this purpose.
If the travel of the brake pedal is still not suitable in relation to comparable vehicles after all the points listed have
been worked through and taken into account, perform the following additional steps:
• Read out the measured value “Adaptation value offset wheel brake stiffness” and upload the ODIS protocol to
GFF database.
• Run ODIS test plan “0023 - Brake booster / bleed brakes”.
• It is essential to charge the vehicle for at least 60 seconds so that the stiffness adaptation routine is performed.
Then read out the measured value and upload the protocol to the GFF database.
• A new software version for the ABS/ESC control unit is being prepared.
Warranty
Claim Type
• 110 up to 48 Months/50,000 Miles.
• If the vehicle is outside any warranty, this Technical Service Bulletin is informational
only.
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
Service Number:
4708
Damage Code:
0011
Labor Operations:
Bleed brake system
4701 0750
See SRT
Diagnostic Time:
GFF
0150 0000
Time stated on
the diagnostic
protocol (Max 70
TU)
Road test prior to the service procedure
0121 0002
10 TU
Road test after the service procedure
0121 0004
10 TU
As per TSB 2068205/4
Claim Comment:
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
All part and service references provided in this TSB (2068205) 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.