Bulletin #: 1809

Advanced Technical Information

4

Part ID: 4407

Clicking at the Rear Wheels during Hard Cornering Maneuvers

Vehicles Affected
Model

Model Year

Model Type

VIN Range

Vehicle Specific Equipment

918 Spyder

2015

918

All

n/a

Revision History
Revision

Release Date

Changes

0

November 14, 2018

Original document

Condition (Customer complaints/workshop findings)
During hard cornering maneuvers, a rhythmic clicking noise may be emitted from the rear axle hubs.
Technical Background (What is causing the issue?)
This noise is a non-hazardous, non-destructive. The root cause is the relative movement of the wheel and brake rotor against the 5 drive
pins of wheel hub. This tiny amount of movement produces a clicking sound that propagates through the rigid multi-ball suspension
joints and rigid carbon structure of the vehicle. Improper wheel nut tightening or trace amounts of lubricants, debris and corrosion between the mating surfaces of the wheel hub, brake rotor and wheel all can facilitate this movement.
Service Information (Instructions to technician)
1. Remove the rear wheels, brake calipers and rotors.
2. Inspect and gently clean all four (4) mating surfaces of the wheel hub, brake rotor, wheel with a green household Scotch-Brite pad
followed by solvent on clean cloth. Spraying the surfaces with aerosol brake cleaning solution only spreads any lubricants.
Note: Do not use any aggressive abrasives or power tools!
3. Re-installed brake rotors using new microencapsulated M6 screws. Torque: 8 Nm
4. Re-installed brake calipers using new M10 nuts. Torque: 65 Nm
5. Re-install the wheels per workshop instructions or owner’s manual. Torque: 650 Nm
Note: Apply the McLube Sailkote lubricant only sparingly to the actual mating surfaces of the wheel nut and wheel. This lubricant easily
propagates to adjacent or connected surfaces if used too liberally. Remove any excess lubricant with solvent and a clean cloth. Allow
lubricant to dry completely before installing wheel nut.
Note: The final tightening torque of the center locking nut must be achieved while the torque wrench is in continuous, sweeping motion
in order to achieve the appropriate clamping force. If this does not occur, loosen the nut at least180 degrees and try again.

AfterSales

November 14, 2018
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Bulletin #: 1809

Advanced Technical Information

Part ID: 4407

4

Search Items (Tags, keywords, etc that can be used to search for this document)
Clicking noise, rear axle, rear wheel, hard cornering, track use, hubs

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.

©2018 Porsche Cars North America, Inc.

AfterSales

November 14, 2018
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