Audi TT (2007 year). Manual — part 234

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.

17

Like in Audi A3 models after November 2005, the
contactless brake light sensor is used on the Audi
TT. Brake light and brake test switches are no longer
required on the brake pedal.
The pedal assembly has been adopted from the
Audi A3.

381_020

Brake light sensor

Power brake unit / brake servo

In the case of the 16" systems, 10" single brake ser-
vos are used on left-hand-drive models and 7/8" tan-
dem brake servos on right-hand drive models.

Vehicles with 17" systems are equipped with 11" sin-
gle brake servos for left-hand-drive models and with
7/8" tandem brake servos for right-hand drive mod-
els.

For the Audi TT, no dual rate characteristic* was
applied to the brake servo.

The OHB-V function known from the Audi A3 * was
implemented on vehicles with 3.2l VR6 engine and
dual-clutch gearbox.

381_019

* dual rate and OHB-V are described in SSP 313

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.

18

ESP

System components

ESP unit

The Audi TT features a new ESP generation by Conti-
nental-Teves with the designation Mk60E1.

As with the Mk25E1 in the current Audi Q7, the
Mk60E1 has analogised switch valves
(4 intake valves and 2 block valves) and an inte-
grated pressure sensor. In the case of analogised
switch valves, the port cross-section is determined
by the activation current. Unlike systems with con-
ventional switch valves with the valve positions
open and closed, more precise brake control is pos-
sible.

381_023

Block valve

Inlet valve

ESP hydraulic unit
(excerpt showing the hydraulic
control device for a wheel brake)

Linearised switch valves

381_022

Note

Due to the use of linearised switch valves, it is
no longer possible to disconnect the control
unit from the hydraulic unit in the service work-
shop.

In the ESP control unit has the same integrated
functions as in the Mk60 control unit on the Audi
A3, however these functions have been adapted to
the Audi TT. The hill hold assist (hha) and driver
steering recommendation (dsr) functions will be
implemented at a later date. The Audi A3 system
has been modified with regard to the operation of
the ESP Off key.

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.

19

Sensor unit G419

The sensor unit comprises senders G200 (lateral
acceleration sender), G202 (yaw rate sender) and, on
models with quattro four-wheel drive, G251 (longitu-
dinal acceleration sender) . The sensor unit has
been adopted from the Audi A3. The service proce-
dures for calibrating the sensors are the same as for
the Audi A3.

381_024

Wheel speed sensors G44 - G47

The wheel speed sensors for wheel speed measure-
ment have been adopted from the Audi A3.

Steering angle sender G85

The steering angle sender is identical in design and
function to the sender on the Audi A3.

381_026

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.

20

ESP

Operation and displays

The functions of button E256 for ESP and TCS were
extended as follows:

Briefly pressing the button (<3 s) deactivates only
the TCS function. TCS OFF improves traction when
starting from a stop on loose surfaces (e.g. on snow
or sand).
TCS OFF is active up to a road speed of 70 kph. TCS
is switched on automatically when this speed is
exceeded.In all-wheel-drive models, TCS is automat-
ically switched off again when the vehicle's road
speed drops below 70 kph. In front-wheel-drive
models, TCS is not automatically switched off when
the vehicle's road speed drops below this threshold.

If the button is pressed for longer than 3 s, the ESP
function is switched off.

When the brake is applied, TCS and ESP are
switched on again for the duration of the braking
manoeuvre and remain active until a stable driving
condition is restored.

The ESP function is activated automatically if faults
are diagnosed in the magnetic ride system or when
actuating the rear spoiler.

If the button is pressed for longer than 10 s, the ESP
function is switched on again and cannot be
switched off again until the ignition has been
turned off and on again.

381_025

381_027

TCS OFF

381_027a

SWITCHED

ESP

OFF

381_027b

ESP / TCS ON