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. 

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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.

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* 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. 

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Block valve

Inlet valve

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

Linearised switch valves

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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.

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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. 

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381_027

TCS OFF

381_027a

SWITCHED

ESP

OFF

381_027b

ESP / TCS ON