BMW X5 3.0i SAV 2005 - Manual (Page 101)

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Brake Force Display Flat Tire Monitor
The Brake Force Display lights up in
two stages, depending on how force-
fully you apply the brakes.
The display has two levels:
> Normal braking:
The brake lamp 1 and the center
brake lamp light up
> Heavy braking and braking with ABS:
The brake lamps 1 and 2 light up
together with the center brake lamp.
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The concept
The Flat Tire Monitor keeps track of the
inflation pressures in the four fitted tires
as you drive. The system provides an
alert whenever the inflation pressure
drops significantly in relation to the
pressure another tire.
The check of the tire inflation pressure
is based on monitoring the relative
speeds of the wheels. A flat is detected
and reported on the basis of a deviation
in certain speed ratios.
Functional requirement
To ensure reliable operation, the sys-
tem should have been initialized with
the correct tire inflation pressure.
System limits
The Flat Tire Monitor cannot indi-
cate sudden severe tire damage
caused by outside factors and does not
detect a natural, even pressure drop in
all four tires.
<
In the following situations, the system
could be delayed or malfunction:
> When driving on snow-covered or
slippery road surfaces
> In the case of performance-oriented
driving: slip on the drive wheels, high
lateral acceleration
> False alarms and undetected loss of
pressure may occur when you are
driving with snow chains fitted.
Online Edition for Part No. 01 41 0 158 701 - © 10/04 BMW AG