Daf LF.book - Peterbilt Motors Company

Emergency repairs
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Always use stands to support the chassis when carrying out repairs
or service under a vehicle which is resting on a jack.
To prevent deformation of the axle housing, the jack must under no
circumstances be located directly under the axle housing or the
differential casing.
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).
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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.
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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.)
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