Tyre Pressures - BMW 730i Owner's Handbook Manual

Fitting and removing
The procedure for fitting and removing the ball
hitch is described in the enclosed manufac-
turer's operating instructions.
Before a journey
Nose weight
The trailer's nose weight must be at least 25 kg,
approx. 55 lb.
The permissible nose weight is indicated on
page 244.
The trailer's nose weight affects the towing
vehicle, and must not lead to the car's gross
weight limit or rear axle load limit being
exceeded if a trailer is being towed. The car's
payload limit is reduced by the weight of the
trailer tow hitch and, if a trailer is being towed,
by its nose weight. The gross weight limit for
the combined car and trailer must not be
exceeded.
Loads
When loading the trailer, make sure that the
weight is kept as low as possible and stowed if
possible close to the axle.
A low centre of trailer gravity makes the outfit
much more stable and safe to drive.
Do not exceed either the trailer's permitted
gross weight or the specified permitted towing
load for the car. The smaller value is the limit
which should be adhered to.

Tyre pressures

Check the car's and the trailer's tyre pressures
most carefully. For the car, the tyre inflation
pressures for trailer operation apply, see
page 220. Every time you correct the tyre pres-
sures, reinitialise the Run Flat Indicator, see
page 87. Comply with the manufacturer's spec-
ifications for the trailer.
Run Flat Indicator
Reinitialise the Run Flat Indicator after a trailer
has been attached or detached, see page 87.
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Outside mirrors
Two outside mirrors which bring both rear cor-
ners of the trailer into your field of view are
required by law. Mirrors of this kind can be
obtained from BMW Service.
Electrical consumers
When towing a caravan, try to avoid operating
electrical equipment for too long at a time, in
order to limit the drain on the car's battery.
The power output of the trailer's rear lights
must not exceed the following values:
Flashing turn indicators: 42 W each side
Stop lights: 60 W each side
Brake lights: 84 W total
Rear fog lights: 42 W total
Reversing lights: 42 W total.
Before starting a journey, check that the
trailer's rear lights are operating correctly.
Driving without functioning rear lights could put
other road users at risk.<
Towing a trailer
Do not exceed a speed of 80 km/h,
approx. 50 mph, otherwise the trailer may
start to snake depending on design and
Stopping snaking
If the trailer begins to snake, the outfit can only
be stabilised by braking hard immediately. Only
attempt to steer out of the situation if this is
absolutely essential; make any steering move-
ments as carefully as possible.
Gradients
In the interests of safety and to avoid holding up
other traffic, do not attempt to climb gradients
steeper than 12Ξ. If a supplementary permit
for heavier towing loads has been obtained, the
limit is 8Ξ, see page 244.
load.<