GMC 1976 ZEO 6083 Maintenance Manual page 225

5- 6
BRAKES
VEHICLE PULLS TO ONE SIDE
Cause
Grease or fluid on lining .
Improper lining contact with
drum .
Wheel bearings excessively loose .
Loose backing plate.
Linings not to specifications,
or primary and secondary shoes
reversed . New and used linings
mixed on one end of vehicle.
Tires not properly inflated or
unequal wear of tread . Different
tread design .
Linings charred or drums scored .
Wheel cylinder link off shoe .
Defective wheel cylinder .
Obstruction in line .
Water, mud, etc., in brakes .
Loose steering gear, etc.
Incorrect geometry setting of
front suspension .
Weak or broken retracting
springs.
Out-of-round drums.
Clogged or crimped hydraulic
line .
Remedy
Replace with new linings. Linings with even a
slight trace of grease or fluid may effect the
operation of the brakes and can seldom be salvaged
by cleaning . Correct cause of grease or fluid
reaching linings .
Grind or replace lining .
Adjust wheel bearings.
Tighten backing plate.
Various kinds of linings have different frictional
effects on the drums and on each other. Each wheel
must have similar linings. The primary and secon-
dary linings must not be interchanged . Use only
factory specified linings.
Inflate tires to specified pressures. Rearrange
tires so that a pair with non-skid tread surfaces
of similar design and equal wear will be installed
on front wheels and pairs with like tread will be
installed on rear wheels .
Sand surfaces of linings and drums. Remove parti-
cles of metal that have become embedded in sur-
faces of linings. 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 sup-
port assembly for damage .
Adjust steering gear, etc.
Adjust geometry so that vehicle does not have a
tendency to lead when driven on a level road .
Check springs-replace bent, open-coiled or cracked
springs.
Resurface or replace drums in left and right hand
pairs (both front and both rear).
Repair or replace line .