GMC 1993 Safari Owner's Manual page 173

Disc Brake Wear Indicators
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 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
The brake wear warning sound means that sooner or later your
brakes won't work well. That could lead to an accident. When you
hear the brake wear warning sound, have your vehicle serviced.
I
I
r
NOTICE
Continuin- to drive with worn-out brake pads could result in costly brake
repai
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 your brakes.
Rear Drum Brakes
Your rear drum brakes don't have the wear indicators, but if you ever hear a
rear brake rubbing noise, have the rear brake linings inspected. 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 brakes replaced,
have the rear brakes inspected, too.
Brake linings should always be replaced as complete axle sets.
Brake Pedal Travel
See your dealer 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 of brake
trouble.
Brake Adjustmenr
Every time you make a brake stop, your disc brakes adjust for wear. If your
brake pedal goes down farther than normal, your rear drum brakes may need
adjustment. Adjust them by backing up and firmly applying the brakes a few
times.
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