122-C9S9Q-12

Bulletin #: 1810
Advanced Technical Information
Part ID: 4651, 4654
4
Loose M6 Screws Securing PCCB Rotors to Wheel Hub
Vehicles Affected
Model
Model Year
Model Type
VIN Range
Vehicle Specific Equipment
911T/ GT2RS, GT3 and GT3RS
2017-on
(991)
N/A
With Option I450 PCCB Brakes
Revision History
Revision
Release Date
Changes
0
November 16, 2018
Initial Release
Condition (Customer complaints/workshop findings)
The M6 screws securing the PCCB rotor assembly to the wheel hub may loosen during use.
Technical Background (What is causing the issue?)
1. The threads of the original M6x12 mm screw fasteners, used to
secure the rotor to each wheel hub:
- Were not coated with a microencapsulated thread locking compound.
2. Were only tightened to 5 Nm.
- Thermal cycling and vibration may cause these screws to loosen.
- Therefore, the original screws are to be replaced with M6x10 mm
screws.
3. New screws have microencapsulated coating on the threads.
4. Tightened to 10 Nm.
- This is to be done during routine wheel/brake service.
- A separate repair service to replace these screws should not be
initiated.
- The new, microencapsulated screws must be replaced each time
they are removed in the future.
Note: Any loosened screws are fully captivated within their recessed
locations and will not cause any type of mechanical damage or safety
issue.
AfterSales
November 16, 2018
Page 1 of 2
Bulletin #: 1810
Advanced Technical Information
Part ID: 4651, 4654
4
Service Information (Instructions to technician)
During routine wheel/brake service, replace the old type screws
(99901502509) with the new type screws (99907357201).
Tighten to 10 Nm.
Production Solution (What was done in production to counteract the condition, when, etc?)
The new microencapsulated screws will be installed on during vehicle assembly and the parts system updated.
Warranty (How to claim issue in the warranty system)
Add replacement screws to the repair order. 8 screws required per vehicle.
Search Items (Tags, keywords, etc that can be used to search for this document)
PCCB, Ceramic, Rotor, Loose, Screws
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.
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AfterSales
November 16, 2018
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