GMC T-Series 2007, Owner'S Manual, Page: 167 / 356

It is always wise to go slower and be cautious if
rain starts to fall while you are driving. The surface
may get wet suddenly when your reflexes are
tuned for driving on dry pavement.
The heavier the rain, the harder it is to see.
Even if your windshield wiper blades are in good
shape, a heavy rain can make it harder to see
road signs and traffic signals, pavement markings,
the edge of the road, and even people walking.
It is wise to keep your wiping equipment in
good shape and keep your windshield washer
fluid reservoir filled with washer fluid. Replace your
windshield wiper inserts when they show signs
of streaking or missing areas on the windshield,
or when strips of rubber start to separate from
the inserts.
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CAUTION:
Wet brakes can cause accidents. They
may not work as well in a quick stop and
may cause pulling to one side. You could
lose control of the vehicle.
After driving through a large puddle of
water or a vehicle wash, apply your brake
pedal lightly until your brakes work
normally.
Driving too fast through large water puddles
or even going through some vehicle washes can
cause problems, too. The water may affect
your brakes. Try to avoid puddles. But if you
cannot, try to slow down before you hit them.
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