BMW 8 Coupe Series, Owner'S Handbook Manual

Page: 325 / 390

Run-flat tyres
Safety notes
WARNING
A run-flat tyre which has low tyre inflation pres‐
sure or no tyre inflation pressure at all will
change the vehicle's handling characteristics,
for example there may be reduced directional
stability when braking, longer braking distances
and different self-steering characteristics.
There is a danger of accidents. Drive with care
and do not exceed a speed of 80 km/h,
50 mph.
Maximum speed
If a tyre is damaged you can continue your jour‐
ney, but do not exceed a maximum speed of
80 km/h, 50 mph.
Continuing a journey with a flat tyre
Note the following if you continue a journey with
a flat tyre:
1. Avoid violent or sudden braking and steering
manoeuvres.
2. Do not exceed a speed of 80 km/h, 50 mph.
3. As soon as there is an opportunity, check the
tyre inflation pressure in all four tyres.
If all four tyres are inflated to the correct tyre
inflation pressures, the runflat indicator might
not have been initialised. In this case initialise
the system.
Possible driving distance with a deflated
tyre
The possible driving distance varies depending
on the load and stresses the vehicle is subjected
to, for example speed, road properties, outside
temperature. The driving distance can be shorter
or, if the driving style is more careful, longer.
If the vehicle is moderately loaded and used un‐
der favourable conditions, it is possible to travel
up to 80 km, 50 miles.
Driving properties with damaged tyres
On a journey with damaged tyres, handling char‐
acteristics change and may result in the following
situations, for example:
▷ The vehicle losing traction more quickly.
▷ Longer braking distances.
▷ Changed self-steering characteristics.
Adapt your driving style. Avoid abrupt steering or
driving over obstacles, for example kerbs or pot‐
holes.
Final tyre failure
Vibration or loud noises during the journey may
be an indication that the tyre has finally failed.
Reduce your speed and stop the vehicle. Parts of
the tyre could detach, which could lead to an ac‐
cident.
Do not continue driving, but contact a Service
Partner of the manufacturer or another qualified
Service Partner or a specialist workshop.
System limits
In the following situations, the system could be
slow to respond or operate incorrectly:
▷ A natural, even loss of tyre inflation pressure
in all four tyres that occurs over time is not
detected. Consequently, check the tyre infla‐
tion pressure at regular intervals.
▷ No warning can be given in the event of sud‐
den tyre failure caused by external factors.
▷ If the system has not been initialised.
▷ When driving on snow-covered or slippery
surfaces.
▷ Dynamic driving style: drive wheels slipping,
high lateral acceleration.
▷ Driving with snow chains.
Seite 325
Wheels and tyres
MOBILITY
325
Online Edition for Part no. xxx - VI/18