Pontiac FIREBIRD 1972 Service Manual page 407

5 -4 1972 PONTIAC SERVICE MANUAL
Wheel bearings excessively loose.
Adjust wheel bearings.
Loose backing plate at rear axle or front knuckle. Tighten backing plate.
Linings not to specifications, or primary and Various kinds of linings have different frictional
secondary shoes reversed. New and used linings effects on the drums and on each other. Each wheel
mixed on one end of car. must have similar linings. The primary and secondary
linings must not be interchanged. Use only factory
specified linings.
Tires not properly inflated or unequal wear of Inflate tires to specified pressures. Rearrange
tread. Different tread design. tires so that a pair with non-skid tread surfaces of
similar design and equal wear will be installed on
front wheels and another pair with like tread will be
installed on rear wheels.
Linings charred or drums scored.
Wheel cylinder link off shoe.
Defective wheel cylinder.
Obstruction in line.
Water, mud, etc., in brakes.
Sand surfaces of linings and drums. Remove particles
of metal that have become embedded in surfaces of
linings. See COMPLETE BRAKE RECONDITIONING
regarding road dirt grooving brake drums. Seriously
charred linings should be replaced.
Check boot for holes. Check for burrs on wheel
cylinder piston caused by piston forced against stop.
Reinstall link.
Repair or replace as required.
Clear or replace as required.
Remove any foreign material from all brake parts
and the inside of drums. Lubricate shoe ledges and
rear brake cable ramps with grease. Examine support
assembly for damage.
Weak chassis springs, loose steering gear, etc.
Replace springs, adjust steering gear, etc.
Incorrect geometry setting of front suspension.
Adjust geometry so that car does not have a
tendency to lead when driven on a level road.
Rigid and flexible shoes intermixed. Use only approved parts, in sets.
EXCESSIVE PEDAL PRESSURE REQUIRED T O
STOP CAR
CAUSE
Brake adjustment not correct.
Improper lining.
Improper shoes.
Grease or fluid soaked linings.
See BRAKE CAUTIONS.
REMEDY
Adjust brakes.
Install factory specified shoes.
Install factory specified shoes.
Correct cause and replace linings, if necessary.
Rusted wheel cylinder.
Replace necessary parts.
Wheel cylinder link incorrectly aligned.
Check wheel cylinder piston and boot for damage.
Install link.