Audi R8 2007 Owner's Manual Page 138

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Intelligent technology136
front wheels is not obstructed, otherwise the brakes can overheat.
Power steering
The power steering assists the driver when turning the
steering wheel (with the engine running).
The power steering assists the driver by reducing the force needed
to turn the steering wheel.
The power steering does not function when the engine is switched
off. In this case the steering wheel is very hard to turn.
If the steering is held at its turning limit when the car is stationary,
this will place an excessive load on the power steering system. In
this case, the power steering system will make noises. It will also
reduce the idling speed of the engine.
Caution
Do not keep the steering in the full-lock position for longer than
15 seconds when the engine is running – this could cause damage
to the power steering system.
Note
If the power steering should fail at any time or the engine is
switched off (for instance when being towed), the car can still be
steered. However, more effort will be required to turn the steering
wheel.
If the system is leaking or malfunctioning, please take the car to
a qualified workshop as soon as possible.
The power steering requires a special hydraulic fluid. The
container for the fluid is located in the engine compartment. The
correct fluid level in the reservoir is important for the power
steering to function properly. The hydraulic fluid level is checked at
the Inspection Service.
Four-wheel drive (quattro®)
On quattro models the engine power is distributed to all
four wheels
General notes
On four-wheel drive vehicles, the engine power is distributed to all
four wheels. The distribution of power is controlled automatically
according to your driving style and the road conditions. Also refer
to page 132.
Winter tyres
Thanks to its four-wheel drive, your car will have plenty of traction
in winter conditions, even with the standard tyres. Nevertheless, we
still recommend that winter tyres should be fitted on all four wheels
when winter road conditions are expected, mainly because this will
give a better braking response.
Snow chains
On roads where snow chains are mandatory, this also applies to cars
with four-wheel drive page 171, “Snow chains”.
Replacing tyres
The dimensions of the wheels and tyres used on four-wheel drive
vehicles must comply with the manufacturer's specifications
page 168, “Replacing wheels and tyres”.
WARNING
Even with four-wheel drive, you should always adjust your
speed to suit the conditions. Do not let the extra safety provided
tempt you into taking any risks when driving – this can cause acci-
dents.
The braking ability of your car is limited by the grip of the tyres.
In this respect, your car is no different from a car without four-
wheel drive. So do not be tempted to drive too fast on icy or slip-
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