122-Y9K4F-09

Service
Technical Information
105/18 ENU
4653
4
Noise Symptom - Noise From Rear Axle Wheel Assembly: Follow special instructions (SY
105/18)
Vehicle Type:
911 GT2 RS/GT3 RS/GT3 (991)
Model Year:
As of 2014 up to 2019
Subject:
Wheel assembly on rear axle
Symptom:
During and after race track use, loud noises can sometimes come from the wheel assembly on the rear
axle - particularly on bends.
Cause:
Particles of dirt on the contact surfaces can cause micro-movements in the wheel assembly on the rear
axle (rim/brake disc/wheel hub) and this can result in loud noises.
Remedial
Action:
In the event of a customer complaint, clean the wheel assembly on the rear axle as described under
"Work Procedure".
Date of
Introduction:
Since June 14, 2018 or as of chassis number WP0ZZZ99ZKS158805, closer attention has been
paid during production to ensuring that there are no particles of dirt on the affected components before
fitting them.
Tools:
•
•
•
Work Procedure: 1
Brass brush
Microfibre cloth
Brake cleaner
Preliminary work:
1.1
Remove wheel and check central wheel lock.
Workshop Manual '440519 Removing and installing wheel with central bolt'
1.2
Remove brake caliper.
Workshop Manual '474119 Removing and installing rear brake calliper'
1.3
Check threaded joint for wheel driver pins for a torque of 22 Nm (16 ftlb.)
and then remove brake disc. If the pins can still be turned, replace pins and screws
and clean the thread and contact surfaces to remove any remaining screw-locking
material.
Workshop Manual '465319 Removing and installing rear brake disc'
Workshop Manual '465419 Removing and installing rear PCCB brake disc'
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105/
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Technical Information
Check wheel driver pins for damage. If there are visible signs of damage, replace pins and
screws and clean the thread and contact surfaces to remove any remaining screw-locking
material.
WARNING
Brake cleaner

Wear personal protective gear.

Ensure that there is good ventilation.

Avoid contact with brake cleaner.
Information
Always make sure that the cleaned surfaces are kept clean until assembly is complete.
2
Clean wheel assembly on the rear axle:
2.1
Brush off wheel hub ( Cleaning wheel hub
-1-) using a brass brush until all particles
of dirt have been removed. Then, spray a
microfibre cloth with brake cleaner and use
it to rub off the wheel hub ( Cleaning wheel
hub -1-).
Cleaning wheel hub
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Service
Technical Information
2.2
105/18 ENU
4653
4
Clean brake dust off the inner brake disc hub
( Cleaning brake disc hub -1-) and brush
off the contact surface between the brake
disc and wheel hub ( Cleaning brake disc
hub -2-) using a brass brush until all particles
of dirt have been removed. Then, spray a
microfibre cloth with brake cleaner and use it
to rub off the cleaned areas.
Cleaning brake disc hub
2.3
3
Clean the contact surfaces between the
rim and brake disc ( Contact surfaces
between rim and brake disc -1 and 2-) using
a microfiber cloth and brake cleaner (do not
use a brass brush).
Subsequent work:
3.1
Install brake disc.
 Workshop Manual '465319 Removing and
installing rear brake disc'
 Workshop Manual '465419 Removing and
installing rear PCCB brake disc'
3.2
Install the brake caliper.
 Workshop Manual '474119 Removing and
installing rear brake calliper'
3.3
Install wheel.
 Workshop Manual '440519 Removing and
Contact surfaces between
rim and brake disc
installing wheel with central bolt'
End of action required.
Invoicing:
The work involved is invoiced under the labor operation:
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105/
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APOS
Labour operation
46534901
Reworking rear left brake disc
46534902
Reworking rear right brake disc
46535000
Reworking rear brake discs
Technical Information
I No.
For invoicing and documentation using PQIS, enter the following coding:
Location (FES5)
46531
Rear brake disc mounting
Damage type (SA4)
3015
dirty
References:
 Workshop Manual '440519 Removing and installing wheel with central bolt'
 Workshop Manual '474119 Removing and installing rear brake calliper'
 Workshop Manual '465319 Removing and installing rear brake disc'
 Workshop Manual '465419 Removing and installing rear PCCB brake disc'
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.
© Porsche Cars North America, Inc.
Aug 16, 2018
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