Chevrolet 2007 Colorado Owner's Manual page 360

Brake Wear
Your vehicle has front disc brakes and rear
drum 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 can 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 can cause a
brake squeal when the brakes are first applied or
lightly applied. This does not mean something is
wrong with the brakes.
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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 torque specifications in Capacities and
Specifications on page 437.
Rear drum brakes 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.
Brake Pedal Travel
See your dealer/retailer if the brake pedal does
not return to normal height, or if there is a
rapid increase in pedal travel. This could be
a sign that brake service might be required.