Chevrolet Light Duty Truck 1973 Service Manual page 290

5 - 2 4 BRAKES
C O M P O N E N T REPLACEMENT A N D REPAIRS
SHOES AND LININGS—REAR DRUM
BRAKES (Fig. 44)
NOTE: If brake drums are worn severely, it
may be necessary to retract the adjusting
screw. To gain access to the adjusting screw
star wheel, knock out the lanced area in the
brake drum or flange plate using a chisel or
similar tool. Release the actuator from the
star wheel with a small screwdriver on models
with access hole in flange plate or with a wire
hook on models with hole in drum. Back off
the star wheel with a second screwdriver (as
shown in Figures 45 and 46).
After knocking out the metal, be
CAUTIO N:
sure t o remove i t from the inside of the drum
and clean a l l metal from the brake compart­
ment. A new
metal
installed when drum is reinstalled.
Drum brake lining can be inspected through slots in the
flange plate. The portion of lining visible through the
slot will not necessarily be the area of maximum wear
and extra caution is necessary to make sure lining is
replaced prior to the point where the remaining
thickness, as viewed through the inspection slot, is as
follows:
Series 10 (bonded lining), 1/16"
Series 20, 30 (riveted lining), 3/16"
NOTE: Riveted linings should be replaced
when worn within 1/32" of rivet heads.
Removal
NOTE: See Section 4 (Rear Suspension and
Driveline) for non-demountable type hub
and drum removal.
PULL BACK SPRINGS
Fig. 4 4 -Rear Brakes
hole cover must be
PRIMARY SHOE
1. Raise the vehicle on hoist.
2. Loosen check nuts at forward end of parking brake
equalizer sufficiently to remove all tension from
brake cable.
3. Remove brake drums.
CAUTION:
The brake pedal must not be
depressed while drums are removed.
4. Unhook brake shoe pull back springs from anchor
pin and link end, using tool J-8049 (fig. 47).
5. Remove the actuator return spring.
. Disengage the link end from the anchor pin and
6
then from the secondary shoe.
7. Remove hold-down pins and springs using any
suitable tool (fig. 48).
Fig. 45--Flange Plate Access Hole
LIGHT DUTY TRUCK SERVICE MANUAL