Audi TT (2007 year). Manual — part 231

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

5

System components

Subframe

The aluminium subframe bears the wishbones, the
anti-roll bar and the steering gear of the electrome-
chanical steering system. The two brackets for
mounting the wishbones are now common parts.

The Audi TT is living proof that sportiness and light-
weight design go hand in hand. The illustration
shows the aluminium components of the front axle.

Brackets

Subframe

381_002

Wishbone

Self-aligning support

Swivel bearing

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

6

Axles

Swivel bearing, wheel bearing

The aluminium swivel bearing manufactured using
Cobapress technology* is a new part.Its geometric
design allows a wider track width to be achieved.
Steel bushes are press fitted into the swivel bearing
at the track rod and ball joint mounting points.
The third generation wheel bearing is bolted to the
swivel bearing.

The wheel bearings are carry-over parts from the
Audi A3. The screws are now coated with a chro-
mium-6 free material to protect the environment.
The suspension strut is connected to the swivel
bearing by a clamp coupling.

381_003

Suspension strut

Wheel bearing

Swivel bearing

*: The Cobapress process is a casting process in which the component subsequently undergoes a forging
process. The result is high strength and toughness.

Note

Note: Special tool 3424 must always be used to
widen the clamp when installing and removing
the damper!

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

7

381_004

Swivel bearing

Ball joint

Wishbone

Retaining element

The wishbone is attached directly to the subframe at
the inside front and to the body at the inside rear by
means of an aluminium bracket.

Note

Note: after undoing the threaded connection
between the ball joint and wishbone, always
replace the retaining element.

381_005

Wishbone

Subframe

Bracket

Wishbones, ball joint and bracket

The ball joint is connected to the wishbone at three
bolting points. Compared to the Audi A3, the fasten-
ing bolts are integral parts of a separate retaining
element. The bolts and retaining element are
inserted from above through the wishbone and ball
joint.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

8

Axles

381_006

= position of the ball joint in the Audi A3

= lower position of the ball joint in the Audi TT

= position of the centre of roll in the Audi A3

= higher position of the centre of roll in the Audi TT

381_007

Anti-roll bar

Link rod

Anti-roll bar

A tubular anti-roll bar is used on models with front-
wheel drive, while a solid bar is used on quattro
models.
The link rod is a carry-over part from the Audi A3.

The centre of roll is the level with the front axle in
the centre of the vehicle about which the body piv-
ots when subjected to lateral forces, e.g. when cor-
nering.

Wishbones, ball joint and bracket

The ball joint is in a lower position than on the Audi
A3. The result is a higher centre of roll. This
improves roll stabilisation and gives particularly
sporty handling.