Self-Study Programme 285 Running gear in the Audi A8.pdf

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Service.
Running Gear in the Audi A8
Self Study Programme 285
For internal use only
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The requirements to be met by the new A8
running gear were highly diverse and thus led
to a whole series of conflicting technical
aims.
This approach meant that it was possible to
raise the high level of active road safety of the
predecessor model still further and thus to
again set new standards in the luxury
segment.
The remedy to these complex problems was
found in the introduction of new concepts
alongside progressive improvements to
existing ideas and the close coordination of
all sub-systems.
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Contents
Page
Front Axle
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Rear Axle
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Wheel Alignment
General procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Front axle settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Rear axle settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Steering System
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Electrical steering column lock (ESCL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Brake System
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Electromech. Parking Brake
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Operation and display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Electromechanical parking brake CAN data exchange . . . . . . . . . . . . . . . . . . . . . .45
ESP
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
System components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Tyre Pressure Monitoring System
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Tyre pressure monitoring system CAN data exchange . . . . . . . . . . . . . . . . . . . . . .56
Run Flat System - PAX
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
The Self Study Programme contains information on design
features and functions.
Attention!
Note!
New!
The Self Study Programme is not intended as a Workshop
Manual.
Values given are only intended to help explain the subject
matter and relate to the software version applicable when the
SSP was compiled.
Use should always be made of the latest technical publications
when performing maintenance and repair work.
3
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Front Axle
Summary
The new A8 is fitted with the familiar four-link
front axle (refer to SSP 161).
All axle components are new on account of
the geometric and kinematic modifications as
compared to the predecessor model, as well
as the air suspension and the weight
reductions achieved.
Wherever technically feasible, use is made of
identical components for the VW Phaeton and
Audi A8.
A significant new feature is the air
suspension in combination with
electronically controlled dampers (refer to
SSP 292).
Upper link
Mounting bracket
Wheel bearing
housing
Suspension/damper strut
Wheel
bearing
Wheel
hub
Subframe
Anti-roll bar
Subframe bushes (4x)
Anti-roll bar
connecting link
Track control link
Guide link
VW Phaeton / Audi A8 identical components
285_001
4
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System components
Wheel bearing housing
The wheel bearing housing is a forged
aluminium component. The guide and track
control link mounts take the form of press-fit
zinc-iron coated bushes.
Wheel bearing
housing
Link mounting
bushes
285_002
Wheel bearing
Use is made of a 2nd generation wheel
bearing (flange bearing). A Ø 92 mm bearing
is employed for all engines. The wheel speed
sensor ring forms part of the wheel bearing
(refer to ESP).
Wheel
hub
Wheel
bearing
285_076
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