NHTSA ID Number: 10251168
Manufacturer Communication Number: No. 90-21
TSB/Document Date: 2024-03-04
Summary
Symptom based workshop manual for the brake symptom - Brake Pedal Travel Perceived as “Too Farâ€
Connect the Tester to the vehicle and start it. Switch on ignition.
1.3
In the control unit Overview, select the control unit “Brake electronics (PSM incl. parking
brake)”.
1.4
Select the “Service and repairs” menu and then perform and assess the “Functional
testing of the hydraulic unit” function with menu guidance.
Assessment
( )
Hydraulic unit function OK
Action
Ventilate brake system in the conventional way and re-program PSM control
unit.
Continue with Step 2.
(✗)
Hydraulic unit function not OK
Replace PSM control unit incl. hydraulic
unit
Workshop Manual '453055 Replacing
hydraulic unit' (includes automatic
programming of the PSM control unit)
and finally
Continue with Step 7.
Feb 9, 2024
Page 4 of 7
2
Bleed the brake system in the conventional way.
Workshop Manual '470107 Bleeding brake system'
3
Charge high-volt battery for at least 60 seconds and then remove high-volt charger (rigidity learning
routine is initiated).
The steering must be in the straight-forward position (steering angle near 0°).
Workshop Manual '270889 Charging high-voltage battery
'
AfterSales
Service
Symptom-based workshop manual
4
90/21
ENU
4701
4
Re-program PSM control unit.
The basic work procedure for control unit programming is described in the Workshop Manual
Workshop Manual '9X00IN Basic instructions and procedure for control unit programming using the
PIWIS Tester - section on “Programming”'.
Specific information on control unit programming as part of this Technical Information:
Required PIWIS Tester software release:
42.400.050 (or higher)
Type of control unit programming:
Control unit programming using the ‘Automatic
programming’ function of the brake electronics
control unit.
‘Brake electronics (PSM, including parking
brake)’ control unit – ‘Coding/programming’
menu – ‘Automatic programming’ function.
Read and follow the information and instructions
on the PIWIS Tester during the guided
programming sequence.
During the programming sequence, the brake
electronics (PSM, including parking brake)
control unit is re-programmed and then automatically re-coded.
Programming sequence:
Do not interrupt programming and coding.
Once the control units have been programmed and
coded, you will be prompted to switch the ignition off
and then back on again after a certain waiting time.
Backup documentation of the new software versions
is then performed.
Programming time (approx.):
Programming takes up to 15 minutes, depending
on equipment.
Software programmed during this action:
•
PSM control unit software release: 0190
Following control unit programming, the software
release can be read out from the relevant control
unit using the PIWIS Tester in the menu ‘Incremented identifications’.
Procedure in the event of error messages
appearing during the programming
sequence:
Workshop Manual '9X00IN Basic instructions and
Procedure in the event of a termination in
the control unit programming:
Repeat control unit programming by restarting
programming.
procedure for control unit programming using the
PIWIS Tester'.
AfterSales
Feb 9, 2024
Page 5 of 7
4
Service
4701
ENU
Symptom-based workshop manual
90/21
5
Read out and delete PSM control unit fault memories.
6
Exit the diagnostic application. Switch off ignition. Disconnect Tester from vehicle.
7
Switch off and disconnect the battery charger.
8
Check and evaluate brake pedal travel.
Assessment
Action
( )
Brake pedal travel OK
End of action.
(✗)
Brake pedal travel still perceived as
“too long”
Perform further actions.
Continue with Technical Information '9X00IN
further actions'
Further actions
Work
Procedure:
If, after working through and taking note of all the points listed, the brake pedal travel is still not adequate
for comparison vehicles, carry out the following further steps:
1
Read out the ‘Stiffness offset wheel brake’ learning value in the PSM control unit under ‘Measured
values’.
Learning value ‘wheel brake rigidity offset’
Action
> 4 mm (0.15748 inch)
Bleed the brake system.
Go to 2.
< 4 mm (0.15748 inch)
2
Inform the customer of the causes described
above. Carry out further measures/analyses
only after consultation with the importer’s
Technical Support.
Bleed the brake system. Workshop Manual '470107 Bleeding brake system'
Information
The following bleedinroutines must be carried out in the specified sequence:
1. Bleeding routine for electric brake booster (eBKV)
2. Porsche Stability Management (PSM) bleeding routine
3
Feb 9, 2024
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Charge high-volt battery for at least 60 seconds and then remove high-volt charger (rigidity learning
routine is initiated).
The steering must be in the straight-forward position (steering angle near 0°).
Workshop Manual '270889 Charging high-voltage battery'
AfterSales
Service
Symptom-based workshop manual
4
5
90/21
ENU
4701
4
After bleeding the brake system, read out the ‘Stiffness offset wheel brake’ learning value in the PSM
control unit under ‘Measured values’ again.
Learning value ‘wheel brake rigidity offset’
Action
3 mm (0.11811 inch)
Coordination with the importer’s Technical
Support for further procedure.
If the complaint persists, contact Technical Support.
Labor position and PCSS encryption
Information
Invoicing is only possible if none of the specified causes were the reason for the complaint and repairs
were carried out.
Labor position:
I No.
APOS
Labor operation
47010750
Bleeding brake system (in conventional way)
47010753
Bleeding brake system (PSM)
47010756
Bleeding brake system (eBKV)
44052006
Removing and mounting 4 wheels
45305500
Replacing hydraulic unit
45620150
Checking control unit
45622550
Programming PSM control unit
03350060
On-board diagnosis
PCSS encryption:
Location (FES5)
47010
Subjectively unpleasant
Damage type (SA4)
1615
brake system function
Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.
© 2024 Porsche Cars North America, Inc.
AfterSales
Feb 9, 2024
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- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Ideal for hydraulic and disc brakes
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
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TSB/Document ID: No. 90-21
Replacement Service Bulletin Number:
MFR Communication Date: 2024-02-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES, HYDRAULIC
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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