Emergency Repairs
142
CHANGING THE WHEEL
NOTE
After changing a wheel/tire, the difference between the diameters of the
various tires on the vehicle may have become too large (for example, as
a result of differences in tread depth and/or tire pressure).
WARNING
The ABS system cannot cope with too great a difference in tire
diameter and the system will automatically be disengaged.
Consequently, the ABS warning symbol will be shown in the master
display.
Depending on the tire types on the front and rear axle, this phenomenon may
already with a worn tire that is underinflated by 2 bar. So first check the tire pressure
if the warning indicator is on after a tire has been replaced.
WARNING
Hence, there will be no ABS control under extreme conditions!
This is the reason why the maximum permitted difference in tire diameter for new
tires is 14%.
(This may occur when different tire sizes are fitted on the front or rear axles.)
WARNING
When removing a wheel with a cracked or damaged wheel rim,
always deflate the tire (remove the tire valve) in view of possible
tensions in the wheel rim.
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