Drivetrain - Front Axle Chatter/Skip Sensation On Turns
40 Chattering/skipping sensation in front axle on tight turns40 12 21
2017148/6
February 13, 2012.
Supersedes Technical Service Bulletin Group 40 number 10 - 12 dated December 2, 2010 for reasons listed below.
Affected Vehicles
Condition
A chattering/skipping sensation in the front axle during slow speed tight turns (e.g. parking maneuvers) could occur under the following conditions:
^ Tires are cold or ambient temperatures are low.
^ Road surface is wet/dirty.
^ The vehicle has been parked for an extended period of time.
Technical Background
The R8 has the steering dynamic of a sports car. The inner and outer wheels are turned at approximately the same steering angle to ensure an even power distribution through the front self-locking differential during high speed cornering. This steering dynamic minimizes under steer and ensures vehicle stability in high-speed turns.
While maneuvering the vehicle through tight turns at slow speeds under normal conditions (e.g. vehicle parking), the steering angle difference between the inner and outer wheel is not noticeable because the tires' side wall flex is sufficient to compensate. Contact with the road surface is maintained.
However, under certain conditions (such as cold weather, wet/dirty pavement, or a long parking period), a front tire can scrub. The customer may complain about a shudder or a skipping sensation felt in the steering/front suspension of the vehicle during slow speed parking maneuvers.
This is normal performance for the sports car steering dynamic in the R8, and no repairs are required.
Production Solution
Not applicable.
Service
Explain the background to the customer.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.