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98n
Brake force display Flat Tire Monitor
The brake lamps light up in two stages,
depending on how forcefully you apply
the brakes.
> Normal braking:
The brake lamp 1 and the center
brake lamp light up
> Heavy braking:
The brake lamps 1 and 2 light up
together with the center brake lamp.
530de400
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 in
one tire drops significantly in relation to
the pressure in 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 in 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 0 159 867 - © 07/05 BMW AG
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