Chevrolet 1993 Astro Passenger Owner's Manual page 171

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).
I
CAUTION
A
The brake wear warning sound means that sooner or later your
4
brakes won't work well. That could lead to an accident. When you
hear the brake wear warning sound, have your vehicle serviced.
I
NCTICE
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
have the rear brakes inspected, too.
Brake linings should always be replaced
Brake Pedal Travel
See your dealer if the brake pedal does
there is a rapid increase in pedal travel.
trouble.
Brake Adjustment
Every time you make a brake stop, your
you have the front brakes replaced,
as complete axle sets.
not return to normal height, or if
This could be a sign of brake
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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