12-54 Simple inspection and service
NOTE:
• The tire inflation pressures will be higher just
after vehicle operation than before vehicle oper-
ation. The increases in pressure are not abnor-
mal; they occur because the air in the tires
expands as the tires get hot while the vehicle is
moving. Do not release air from the tires at this
time. The pressures will return to normal as the
tires cool down.
• The pressure drops naturally as time passes.
You should therefore check the tire pressure
regularly at least once a month using an air
gauge.
2 Checking tread depth
Check the entire circumference of each tire to make
sure that the remaining depth of the tread pattern on
the part that contacts the road surface is sufficient.
When the tread wears down, slip signs (inter-
rupted sections of the grooves) appear across the
tire at the locations corresponding to the marks.
Replace the tire as soon as the slip signs show up
as continued use is dangerous. P. 12-55
NOTE:
Hydroplaning can occur when driving on a wet
roads at high speeds. When a vehicle hydroplanes,
tires ride up on and slide over a film of water, caus-
ing the driver to lose control of both steering and
braking.
3 Checking for cracks, damage, and
objects embedded in tread
Check both the tread and the sides of each tire for
cracks, damage, and excessive or unusual wear.
Check also for metal pieces, nails, and stones that
might be embedded in the tread or caught between
the tires of dual wheels.
Tread groove depth
limit
1.6 mm (0.06 in.)
WARNING
If the remaining tread is too shallow, the tires
tend to skid and chances of “hydroplaning”
during high speed driving increase. Worn
tires should be replaced as soon as possible.
WARNING
Severely damaged or worn tires are suscepti-
ble to puncture during use and should be
replaced as soon as possible.
Z10804
Z10805
FEFG.book Page 54 Thursday, March 10, 2005 7:30 PM
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