Pontiac FIREBIRD 1972 Service Manual page 409

1972 PONTIAC SERVICE MANUAL
CRUNCH O R GROAN, HOLDING CAR ON HILL
CAUSE REMEDY
Brake dust and possibly linings which have been
Sand linings and remove dust from brakes.
overheated.
HlGH PITCH SQUEAK WHILE BRAKES OPERATE
CAUSE
New linings not yet fully burnished.
Persistent squeak-no apparent cause.
Bonded linings.
LOUD LOW PITCH SQUEAL AT END OF HlGH
RATE STOP
CAUSE
New linings not fully burnished.
REMEDY
Burnish further or sand off high spots of linings.
Sand linings for temporary cure or mild cases.
Install drum springs for stubborn cases of high
pitch squeak.
Install factory specified shoes.
REMEDY
Check adjustment. Sand lining high spots.
Angle on shoe web at adjusting screw notch.
File straight.
Bent backing plate. Top of shoe webs should be
Straighten or replace.
in line with each other looking down on them.
Check after pushing shoes toward backing plate
at top.
Incorrect adjustment. Adjust brakes.
NOTE: Drum springs not effective against /ow pitch
squeal or how/.
CLICKS DURING HlGH RATE STOPS, USUALLY
ONCE PER WHEEL REVOLUTION IN ONE WHEEL
ONLY
CAUSE
Threaded drum.
REMEDY
Cross sand.
CHATTER AT HlGH SPEED
CAUSE REMEDY
Drum out-of-round with 2 or more distinct high Sometimes corrects with usage. Turn drum.
spots in circumference.
PEDAL THROB AT LIGHT APPLICATIONS AT LOW
SPEED
CAUSE
Drum out-of-round or off center.
REMEDY
Turn drum.