GMC 1976 ZEO 6083 Maintenance Manual page 228

PEDAL THROB AT LIGHT
APPLICATIONS AT LOW SPEED
Shoe pads on backing plates dry Pry shoes out with screwdriver-apply grease
and rusty.
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sparingly to shoe pads with feeler stock.
BRAKES
5- 9
Cause
Remedy
Drum out-of-round or off center . Turn drum .
ROUGH FEEL DURING HIGH RATE
STOPS FROM MODERATE SPEED
Cause
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Remedy
Tool chatter. Look for faint Turn drum .
light and darker stripes running
across the braking surface.
LIGHT PEDAL PRESSURE-
BRAKES TOO SEVERE
Cause
Remedy
Brake adjustment not correct.
Adjust brakes .
Loose support assembly .
Tighten rear backing plates .
Adjust brakes .
Small amount of grease or fluid Correct cause and replace linings.
on linings.
Charred linings or scored drums .
Sand surfaces of linings and drums. Clean loose
dust from brake. In severe cases replace shoes.
Warn owner regarding abuse of brakes .
Remove all particles that have become imbedded in
surfaces of linings. Slightly scored drums do not
require replacing or turning.
Improper linings. Install factory specified linings.
SQUEAK IN BRAKE WITH
VEHICLE STATIONARY
(SOMETIMES MISTAKEN FOR
PEDAL SQUEAK)
Cause
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Remedy