Pontiac Sunbird Owner's Manual page 131

...
Your Driving and the Road
Disc Brake Wear Indicators
(CONX)
Continuing to drive with worn-out
brake pads c
V
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 your brakes.
1 3 0
Rear Drum Brakes
Your rear drum brakes don't have 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.