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P A R T 2 - 2 - F - AND P-100 SERIES BRAKE SYSTEMS
2-11
hole fitted into the hole in the
secondary
shoe web. Thread the
cable around the cable guide groove
(Fig. 1).
It is imperative that the cable be
positioned in this groove and not be-
tween the guide and the shoe web.
7. Install the secondary shoe to
anchor (long) spring (Fig. 5).
Be certain that the cable end is
not cocked or binding on the anchor
pin w h e n installed. All parts should
be flat on the anchor pin. R e m o v e
the brake cylinder clamp.
O n front brakes, install the shoe
retracting assist spring.
8. Apply high-temperature grease
to the threads and the socket end of
the adjusting screw. Turn the adjust-
ing screw into the adjusting pivot
nut to the limit of the threads and
then back off Vi turn.
Interchanging the brake shoe ad-
justing screw assemblies from one
side of the truck to the other would
cause the brake shoes to retract
rather than expand each time the
automatic adjusting mechanism op-
erated. T o prevent installation on
the wrong side of the truck, the
socket end of the adjusting screw is
stamped with an R or L (Fig. 6).
T h e adjusting pivot nuts can be dis-
tinguished by the number of lines
machined around the body of the
nut. T w o lines indicate a right hand
nut; one line indicates a left hand
nut.
9. Place the adjusting socket on
the screw and install this assembly
between the shoe ends with the ad-
justing screw nearest the secondary
shoe.
10. H o o k the cable hook into the
hole in the adjusting lever from the
backing plate side. T h e adjusting
levers are stamped with an R or L to
indicate their installation on a right
or left hand brake assembly (Fig. 6).
> \
ADJUSTING SCREW
IDENTIFICATION LINES
H1143-A
FIG. 6—Adjusting Screw and
Lever Identification
11. Position the hooked end of
the adjuster spring in the large
hole in the primary shoe web, and
connect the loop end of the spring
to the adjuster lever hole.
12. Pull the adjuster lever, cable
and automatic adjuster spring d o w n
and toward the rear to engage the
pivot hook in the large hole in the
secondary shoe w e b (Fig. 1).
13. After installation, check the
action of the adjuster by pulling the
section of the cable between the cable
guide and the adjusting lever toward
the secondary shoe w e b far enough
to lift the lever past a tooth on the
adjusting screw wheel. T h e lever
should snap into position behind the
next tooth, and release of the cable
should cause the adjuster spring to
return the lever to its original posi-
tion. This return action of the lever
will turn the adjusting screw one
tooth.
If pulling the cable does not pro-
duce the action described, or i f the
lever action i s sluggish instead of
positive and sharp, check the po-
sition of the lever on the adjusting
screw toothed wheel. With the brake
in a vertical position (anchor at the
top), the lever should contact the ad-
justing wheel one tooth above the
center line of the adjusting screw.
If the contact point is below this
center line, the lever will not lock
on the teeth in the adjusting screw
wheel, and the screw will not be
turned as the lever is actuated by
the cable.
T o determine the cause of this
condition:
a. Check the cable end fittings.
T h e cable should completely fill or
extend slightly beyond the crimped
section of the fittings. If it does not
meet this specification, possible dam-
age is indicated and the cable assem-
bly should be replaced.
b. Check the cable length. T h e
cable should measure \VA
inches
(plus or minus
l
ki inch) from the
far edge of the cable anchor hole
to the inside edge of the cable hook.
c. Check the cable guide for dam-
age. T h e cable groove should be par-
allel to the shoe web, and the body
of the guide should lie flat against
the web. Replace the guide i f i t
shows damage.
d. Check the pivot hook on the
lever. T h e hook surfaces should be
square with the body of the lever for
proper pivoting. Repair the hook or
replace the lever i f the hook shows
damage.
e. See that the adjusting screw
socket is properly seated in the
notch in the shoe web.
BRAKE CARRIER PLATE—
F-100 A N D P-lOO SERIES
TRUCKS EXCEPT 4-WHEEL
DRIVE—FRONT
REMOVAL
1 . Remove the wheel and brake
drum. Disconnect the brake line
from the brake cylinder and sub-
merge the end of the brake line in
a can containing a small amount
of brake fluid. This will minimize
hydraulic line bleeding. R e m o v e the
brake shoes and the brake cylinder.
O n the rear wheels, disconnect the
parking brake lever from the cable.
2. If the rear carrier plate is be-
ing remolded, rotate the axle shaft
so that the hole in the axle shaft
flange aligns with the carrier plate
retaining nuts, then remove the nuts.
Pull the axle shaft assembly out of
the housing with tool 4235-C, and a
slide h a m m e r tool T50T-100-C (Fig.
7). Lift off the carrier plate.
If the front carrier plate is being
replaced, remove the bolts and nuts
that secure the plate to the front
wheel spindle and lift off the plate.
INSTALLATION
1. Position the rear carrier plate
on the retaining bolts in the axle
housing flange. Insert the axle shaft
assembly into the housing so that the
splines engage the differential side
gear, with the bearing retainer slid-
ing onto the retaining bolts and
against the carrier plate. Install the
retaining nuts through the access
hole in the axle shaft flange.
Position the front carrier plate on
the wheel spindle and install the
retaining bolts and nuts.
2. Install the brake cylinder and
brake shoes. O n a rear brake, con-
nect the parking brake cable to the
lever.
3. Connect the brake line to the
brake cylinder, then install the wheel
and brake drum. Adjust the brake
FIG. 7—Axle Shaft Removal
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