Pontiac FIREBIRD 1972 Service Manual page 419

5-16 1972 PONTIAC SERVICE MANUAL
SCREWDRIVER
Fig. 5-12 Preparing to ~ a c k Off Adjusting Screw
are replaced or the setting of the star wheel adjuster has
been changed during some other service operation.
1. Remove wheels and brake drums. It may be neces-
sary to back off the brake shoe adjustment before the
brake drums can be removed. If this is the case, insert
a small rod or screwdriver through the adjusting
screw slot in the backing plate and hold automatic
adjuster lever away from adjusting screw star wheel
and rotate adjusting screw downward (Fig. 5-12 and
5-13).
On rear brake drums on A, B and F Series
vehicles, it will be necessary to knock out the lanced
area in the web of the backing plate using a chisel or
similar tool in order to gain access to the adjusting
screw on rear wheel brake assemblies.
CAUTION: Be sure to remove the metal knock-
out plug fiom the backing plate before reinstall-
ing. Remove all metal fiom the brake
BACKING
I
INSERT SMALL SCREW DRIVER OR AWL
THROUGH BACKING PLATE SLOT AND HOLD
ADJUSTER LEVER AWAY FROM
SPROCKET BEFORE BACKING OFF
BRAKE SHOE ADJUSTMENT
Fig. 5-13 Backing Off Adjusting Screw
compartment. Replace the metal knock-out
plug with a rubber service plug,
2. Remove ridge at open end of drum with #40 grit
sandpaper, or equivalent. Adjust tool J 22364 to
diameter of drum, then adjust brake shoes to fit oppo-
site side of tool (Fig. 5-14).
3. Install wheels and drums.
CAUTION: See Caution on page I of this Sec-
tion regarding the fasteners referred to in the
note below.
Fig. 5-14 Gauging Shoe to Drum Clearance