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P A R T 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.
O n 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 i s 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. R e m o v e 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. D o not push down
the brake pedal after (he brake drum
has been removed.
O n 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. R e m o v e the hold-down spring
cups and springs from the shoes, and
remove the shoes and the adjusting
screw parts from the carrier plate.
D o 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-
A N C H O R PIN PLATE
RETRACTING
SPRINGS
A N C H O R PIN
SECONDARY BRAKE
SHOE A N D LINING
PRIMARY BRAKE
S H O E A N D LINING
—— FRONT OF TRUCK •
ADJUSTING
SCREW SPRING
A N C H O R PIN PLATE
RETRACTING
SPRINGS
BRAKE SHOE
HOLD D O W N
PIN AND
SPRING /
A N C H O R 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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