PART
2-3
-
F-250
AND
F-350,
AND
P-SERIES
BRAKE SYSTEMS
2-19
Installation Too/-2035-N
FIG.
7—Retracting
Spring
Removal
and
Installation
taining bolts, screws, or bolts and
nuts.
2.
Install
the
wheel
or rim and
tire
to the hub and
start
the
retain-
ing
nuts.
3. Position the wheel assembly
on
the spindle.
On trucks with
4-wheel
drive,
in-
stall
the
bearing adjusting
nut
with
the dowel outboard. Install
the ad-
justing
nut
lock
on the
dowel,
in-
stall
the
lock
nut and
torque
to
specifications.
Slide
the
driving
hub on the
axle
shaft
and
install
the
snap ring.
If
the
truck
is
equipped with
a
locking type hub, refer
to
Part
4-4.
4.
Adjust
the
spindle
nut and in-
stall
the
cotter
pin.
5. Adjust
the
brake,
and
then
torque
the
wheel
nuts.
6. Install the dust
cap or hub
cap.
7.
Remove
the
stands
and
lower
the truck.
REAR BRAKE DRUM
REMOVAL
1. Raise
the
truck
and
install
stands.
2.
Remove
the
wheel
and
tire
as
an assembly. Then back off the rear
brake shoe adjustment.
3. Remove
the
rear axle shaft
re-
taining
nuts,
adapters, axle shaft,
and gasket.
4.
Remove the wheel bearing lock-
nut,
lockwasher,
and
adjusting nut.
5. Remove
the hub and
drum
from
the
axle.
6.
Remove
the
brake drum
to
hub retaining screws,
bolts,
or
bolts
and
nuts.
Then remove
the
brake
drum from the
hub.
INSTALLATION
1. Position the brake drum
to the
hub
and
install
the
retaining screws,
bolts,
or
bolts
and
nuts.
2.
Position
the hub and
drum
as
an assembly
on
the axle and start the
adjusting nut.
3. Adjust
the
wheel bearing
nut
and then install
the
wheel bearing
lockwasher
and
locknut.
4.
Install
a new
rear
axle shaft
and gasket, stud adapters,
and re-
taining
nuts.
5. Install the wheel
and
tire
as an
assembly.
6. Adjust
the
brake shoes
and
then remove
the
stand
and
lower the
truck.
SINGLE ANCHOR BRAKE
SHOE
REMOVAL
1. Raise the truck until the wheels
clear
the
floor. Then remove
the
wheel
and
drum.
Do
not push down
the brake pedal after (he brake drum
has been removed.
On trucks equipped with vacuum
boosters,
be sure the engine
is
stopped
and there is
no
vacuum in the system
before disconnecting
the
hydraulic
lines.
2.
Clamp the brake cylinder boots
against the ends
of
the cylinder,
and
remove
the
brake shoe retracting
springs from both shoes (Fig. 7).
3. Remove
the
anchor
pin
plate
(Fig.
8 or
9).
4.
Remove
the
hold-down spring
cups
and
springs from the
shoes,
and
remove
the
shoes
and the
adjusting
screw parts from
the
carrier plate.
Do
not let oil or
grease touch
the
brake linings.
If the
shoes
on a
rear
brake assembly
are
being removed,
remove the parking brake lever, link,
and spring with
the
shoes.
Unhook
the parking brake cable from
the
lever as the shoes are being removed.
5. Remove
the
hold-down spring
pins from the carrier plate.
6. Remove
the
adjusting screw
parts from
the
brake
shoes.
If the
shoes
are
from
a
rear brake
assem-
ANCHOR PIN PLATE
RETRACTING
SPRINGS
ANCHOR PIN
SECONDARY BRAKE
SHOE AND LINING
PRIMARY BRAKE
SHOE AND LINING
—— FRONT OF TRUCK •
ADJUSTING
SCREW SPRING
ANCHOR PIN PLATE
RETRACTING
SPRINGS
BRAKE SHOE
HOLD
DOWN
PIN AND
SPRING /
ANCHOR PIN
PRIMARY BRAKE
SHOE AND LINING
BRAKE CYLINDER
(SINGLE
PISTON)
ADJUSTING SCREW
ADJUSTING
SCREW SPRING
LINK
FRONT OF TRUCK
•
HI 169-A
H1170-A
FIG.
8—Duo-Servo
Single Anchor Brake Assembly
FIG.
9—Uni-Servo
Single Anchor Brake Assembly
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