GMC 1976 ZEO 6083 Maintenance Manual page 229

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BRAKES
CREAK WHEN BRAKES ARE
APPLIED AT LOW VEHICLE SPEED
Anchor pins dry.
SCRAPE IN BRAKES AS PEDAL IS
APPLIED, VEHICLE STATIONARY
Hold-down nail heads dry. Lubricate.
Although adjusting brakes temporarily changes
these noises, lubrication will remedy .
Cause
Cause Remedy
PEDAL SQUEAK
Remedy
Grease anchor pins where shoes bear .
Cause
I
Remedy
Dry pedal bushings or stop light Lubricate.
switch rubbing pedal.
I
CLICKS DURING HIGH RATE
STOPS, USUALLY ONCE PER
WHEEL REVOLUTION IN ONE
WHEEL ONLY
Cause Remedy
Threaded drum .
Cross sand .
CHATTER AT HIGH SPEED
Cause Remedy
Drum out-of-round with two or Turn drum .
more distinct high spots in
circumference .