Self-Study Programme 381 Audi TT coupé ´07 suspension system.pdf

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Service Training
Audi TT Coupé ´07 - Suspension System
Self-Study Programme 381
The new TT by Audi is a thoroughbred sports car.
The suspension system is one of the features key to
meeting this high standard. The basic TT has a con-
ventional steel-sprung suspension - the so-called
"dynamic suspension system". The new Audi mag-
netic ride system is optional. It is a semi-active sus-
pension system with magneto-rheologically
controlled dampers.
Sport or comfort damper settings can be selected at
the touch of a button.
The S-line suspension by quattro-GmbH has been
developed to meet the growing customer demand
for vehicle customisation. This suspension is sport-
ier than the dynamic suspension and reduces vehi-
cle ride height by 10 mm.
381_064
Contents
Axles
Front axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Rear axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Brake system
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
ESP
System components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Operation and displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Steering system
Electromechanical steering system EPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Steering column . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Steering wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Audi magnetic ride
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Functional principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
System components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Function diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
CAN data exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Scope of service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Wheels/tyres
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Self Supporting Tires (SST) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Low tyre pressure indicator 36
Tyre pressure monitoring system (US spec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
The self-study programme teaches the design and function of new vehicle models,
new automotive components or new technologies.
The self-study programme is not a repair manual!
All values given are intended as a guideline only and refer to the software version valid at the time of prepara-
tion of the SSP.
For maintenance and repair work, always refer to the current technical literature.
Reference
Note
Axles
Front axle
Overview
An improved version of the McPherson suspension
is employed. The design of the front axle is identical
to that of the Audi A3. Track width is 13 mm wider
on each side than the Audi A3.
Detail modifications have been made to reflect the
particularly sporty character of the Audi TT. In addi-
tion to the tuning parts (springs, dampers and anti-
roll bars), the same axle components are used in all
TT suspension variants.
Spring
Damper
Swivel bearing
Coupling rod
Anti-roll bar
Ball joint
Wishbone
Subframe
Wheel bearing
381_001
4
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.
Swivel bearing
Brackets
Wishbone
Self-aligning support
Subframe
381_002
5

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