Brake Test; General; Testing Vehicles With No Electric Differential Lock; Testing Vehicles With Electric Differential Lock - Volkswagen Touareg 2010 Workshop Manual

3

Brake test

3.1

General

♦ The drive is provided by the roller dynamometer.
♦ For the test ensure for vehicles with a manual gearbox that the
gear lever is in neutral, and for vehicles with an automatic
gearbox that the selector lever is in »N«.
♦ For the test, observe the specifications provided by the man‐
ufacturer of the roller dynamometer.
Note
The brake regulation systems do not function when ignition is off.
3.2 Testing vehicles with no electric differ‐
ential lock
The brake test must be performed on a single-axle roller dyna‐
mometer.
The maximum test speed must not exceed 6 km/h.
The test rigs authorised by Volkswagen fulfil these requirements.
3.3 Testing vehicles with electric differential
lock
The brake test must be performed on a regulated contra-rotating
roller brake test stand.
„Contra-rotating" means that the dynamometer rollers are driven
forwards on one side and backwards on the other side.
„Regulated" means that the speed of the brake test stand rollers
is so controlled so that there is no difference in speed during the
brake test.
This prevents the transfer of a force through the stationary wheels
(not on the set of rollers) via the propshaft to the rotating wheels
on the rollers.
The forward rotating wheel is measured during the test, which
means two brake tests per axle must be performed.
The maximum test speed must not exceed 6 km/h.
The test rigs authorised by Volkswagen fulfil these requirements.
3.4 Testing the electromechanical parking
brake
3.4.1 Vehicles with no electric differential lock:
Activate »TÜV mode«:
• Rear axle on single-axle roller dynamometer
• Ignition remains switched on
• Front wheels must be stationary for a minimum of 3 seconds.
• Rear wheels must rotate at constant speed between 2.2 and
12 km/h for at least 3 seconds.
Touareg 2010 ➤
Brake systems - Edition 05.2011
5
3. Brake test