Pontiac 2007 G5 Owner's Manual page 301

Brake Wear
Your vehicle has front disc brakes and may have
rear drum brakes or rear disc brakes.
Disc brake pads have built-in wear indicators that
make a high-pitched warning sound when the
brake pads are worn and new pads are needed.
The sound may come and go or be heard all
the time your vehicle is moving, except when
you are pushing on the brake pedal firmly.
CAUTION:
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The brake wear warning sound means that
soon the brakes will not work well. That
could lead to an accident. When you hear
the brake wear warning sound, have your
vehicle serviced.
Notice: Continuing to drive with worn-out
brake pads could result in costly brake repair.
Some driving conditions or climates may cause a
brake squeal when the brakes are first applied
or lightly applied. This does not mean something
is wrong with the brakes.
Properly torqued wheel nuts are necessary to help
prevent brake pulsation. When tires are rotated,
inspect brake pads for wear and evenly tighten
wheel nuts in the proper sequence to GM torque
specifications.
If your vehicle has rear drum brakes, they do not
have wear indicators, but if you ever hear a rear
brake rubbing noise, have the rear brake linings
inspected immediately. Also, the rear brake drums
should be removed and inspected each time the
tires are removed for rotation or changing. When
you have the front brake pads replaced, have the
rear brakes inspected, too.
Brake linings should always be replaced as
complete axle sets.
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