1953 JEEP DJ brake

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Page 333 of 376

JEEP DJ 1953 Service Manual
Jeep
UNIVERSAL
SERIES SERVICE
MANUAL

P h.
Install
the tube seats, flat side toward the check

valve,
and press in with tube nuts or the master

cylinder
brake pipe tube nuts.

BLEEDING

'Jeep'
UNIVERSAL
SERIES SERVICE
MANUAL

P h.
Install
the tube seats, flat side toward the check

valve,
and press in with tube nuts or the master

cylinder
brake pipe tube nuts.

BLEEDING
a.
Before the master cylinder is installed on the
car,
the unit must be bled.

b.
Support the cylinder assembly in a vise and

fill
both fluid reservoirs with approved brake fluid,

e.
Loosely install a plug in each
outlet
of the

cylinder.
Depress the push rod several times until

air
bubbles cease to appear in the brake fluid.

d.
Tighten the plugs and attempt to depress the piston. The piston travel should be restricted after
all
air is expelled.
e.
Install
the master cylinder on the car and bleed
the hydraulic lines at the wheel cylinder. Refer to
Par.
P-7.

P-21.
Wheel
Cylinder
Reconditioning
•
Refer to Fig. P-15.
Note:
Make sure a replacement brake cylinder
has the same part number as the original cylinder.

FIG.
P-15—WHEEL
BRAKE CYLINDER
1— Boot

2—
Piston

3—
Cylinder
Cup
4—
Cup
Spring
5—
Cylinder

6—
Bleeder
Screw
a.
To remove a wheel cylinder,
jack
up the vehicle

and
remove the wheel, hub, and
drum.
Disconnect
the brake line at the fitting on the brake backing
plate. Remove the brake
shoe
return spring which

will
allow the brake
shoes
at the toe to
fall
clear of the brake cylinder. Remove two screws holding
the wheel cylinder to the backing plate.
b.
Remove the rubber dust covers on ends of

cylinder.
Remove the pistons and piston cups and
the spring.

c.
Wash the parts in clean alcohol.

d.
Examine the cylinder bore for roughness or
scoring.
Check
fit of pistons to cylinder bore.
e. When reassembling the cylinder, dip springs, pistons and piston cups in brake fluid.
Install

spring
in center of the wheel cylinder.
Install

piston cups with the cupped surface towards the

spring
so that the flat surface
will
be against
the piston.
Install
pistons and dust covers.
f.
Install
wheel cylinder to the backing plate and connect brake line and install brake
shoe
return

spring.

g. Replace wheel, hub, and
drum.

h.
Bleed the brake lines (Par. P-7).

P-22. TROUBLE
SHOOTING

P-23.
Squeaky
Brakes

In
most cases, squeaks are entirely eliminated by

correct
adjustment of the brakes. Squeaks may be
caused however, by glazed linings, lining wore thin
to the point of
exposed
rivets or by vibration. A

drum
will
not vibrate when the brake is securing

uniform
contact over the entire lining surface, ex
cept when due to improper conditions such as the
linings becoming glazed.
Glazed
surface of the

brake
linings may be removed by a stiff
wire
brush.
Occasionally
squeaks are caused by roughened
sur

face of the
drum,
which can usually be remedied
by rubbing down with emery cloth and by wiping
the brakings surface clean. In extreme cases it may
be necessary to reface the drum in a lathe. Should
this be done, do not remove a metal thickness greater than .030" [0,762 mm.] - .060" [1,52 mm.]

overall
diameter.

P-24. Rattles
in
Brakes

See that the tension of the springs in the brakes

and
attached to the control system are sufficient to

return
brakes and brake mechanism to their normal
position.
Return
springs are so placed that they
keep all slack out of the control system by tension on all joints.

Brakes
will
not rattle inside the
drum
if the springs
holding the
shoes
are kept at the proper tension. 333

Page 334 of 376

JEEP DJ 1953 Service Manual
p

BRAKES
P-25.
SERVICE

SYMPTOMS
Brakes Drag
Brake
Shoes
Improperly Adjusted
Piston Cups Enlarged . . •.
«•
Mineral
Oil or Improper Brake
Fluid
in System. . .

Improper
Pedal

p

BRAKES
P-25.
SERVICE

SYMPTOMS
Brakes Drag
Brake
Shoes
Improperly Adjusted
Piston Cups Enlarged . . •.
«•
Mineral
Oil or Improper Brake
Fluid
in System. . .

Improper
Pedal Adjustment
Clogged Master Cylinder By-Pass Port...

One
Brake Drags
Brake
Shoe
Adjustment Incorrect
v Brake
Hose
Clogged.
Return
Spring Broken
Wheel Cylinder Piston
01
Cups
Defective.........
Loose or Damaged Wheel Bearings

Brake Grabs
—
Vehicle Pulls
to One
Side
Grease
or Brake
Fluid
on
Lining................
Dirt
Between
Lining
and Drum

Drum
Scored or Rough
Loose Wheel Bearings. .
Axle Spring Clips Loose
Brake
Backing Plate Loose

Brake
Lining
..

Brake
Shoe
Reversed
Tires
Under-Inflated -
Tires
Worn Unequally
Glazed
or Worn
Lining

Restricted Brake
Line

Excessive Pedal Travel
Normal
Lining
Wear

Lining
Worn Out ... .

Leak
in Brake
Line.

Scored Brake Drums
Incorrect
Brake
Lining.

Air
in Hydraulic System

Spongy Brake Pedal
Air
in
Lines.
Brake
Shoe
Adjustment Incorrect
Insufficient Brake
Fluid

Excessive Pedal Pressure
Grease
or Brake
Fluid
in
Lining

Shoes
Improperly Adjusted

Warped
Brake
Shoes
Distorted Brake Drums
Glazed
or Worn
Lining

Restricted Brake
Line
Faulty
Brake Cylinder Insufficient Brake
Fluid.

Squeaky Brakes
Shoes
Warped or Drums Distorted
Lining
Loose.....
Dirt
Imbedded in
Lining

Improper
Adjustment.

Oil
or Grease on
Lining
Glazed
or Worn
Lining.

Drum
Scored
DIAGNOSIS

PROBABLE
REMEDY

Adjust
Flush
all
lines
with Alcohol. Install new cups in wheel and Master Cylinders

Adjust
Master Cylinder Eye Bolt
Clean
Master Cylinder

Adjust
Replace Replace
Replace
Adjust
or Replace
Replace
Lining

Clean
with Wire Brush

Turn
Drum and Replace
Lining

Adjust
Tighten Tighten
Different Kinds on Opposite Wheels

Forward
and
Rear
Shoes
misinstalled
Inflate
Replace or Rotate Replace Linings

Locate
and Repair

Adjust

Replace
Locate
and Repair Replace or Regrind Replace

Fill
Master
Cylinder
— Bleed Lines
Bleed Lines
Adjust

Fill
Master Cylinder
Replace
Lining
Major
Adjustment
Replace
Replace or Regrind Replace Linings * .

Locate
and Repair
Repair
or Replace
Fill
Master Cylinder Replace
Replace
Wire
Brush or Replace

Adjust
Replace Linings Replace Linings

Turn
Drum and Replace Linings 334

Page 335 of 376

JEEP DJ 1953 Service Manual
Jeep
UNIVERSAL
SERIES SERVICE
MANUAL

WHEELS

Contents

SUBJECT PAR.

GENERAL
Q-l Wheel Balancing. Q-2

WHEEL BEARING SERVICE.
......
Q-3
Checking
Front Wheel Bearings Q-4

Checking

Page 336 of 376

JEEP DJ 1953 Service Manual
Q

WHEELS
FIG.
Q-2—FRONT
WHEEL

ATTACHING
PARTS —
2-WHEEL-DRIVE

1—
Steering
Knuckle

2—
Brake

3— Hub
Grease
Seal
4—
Inner
Bearing
Cone

5—
Inner
Bearing
Cup

Page 337 of 376

JEEP DJ 1953 Service Manual
Jeep
UNIVERSAL
SERIES SERVICE
MANUAL

FIG.
Q-5—REAR
WHEEL

ATTACHING
PARTS —
FLANGED
AXLE

1—
Brake
Backing Plate

2—
Retainer
Ring

3—
Unit-Bearing

4—
Oil
Seal

'Jeep'
UNIVERSAL
SERIES SERVICE
MANUAL

FIG.
Q-5—REAR
WHEEL

ATTACHING
PARTS —
FLANGED
AXLE

1—
Brake
Backing Plate

2—
Retainer
Ring

3—
Unit-Bearing

4—
Oil
Seal
5—
Retainer
Plate 6—
Brake
Drum
7—
Cup
Plug
8—
Flanged
Axle Shaft
14284

Q-4. Checking
Front
Wheel Bearings

Raise
the front end of the vehicle with a
jack

so that the tires clear the floor.

Grip
the tire and
test
sidewise shake of the wheel.

If
bearings are correctly adjusted, shake of the
wheel
will
be just perceptible and wheel
will
turn

freely with no drag.

If
bearing adjustment is too tight, the rollers may

break
or
become
overheated. Loose bearings may cause
excessive
wear and noise.

If
this
test
indicates bearing adjustment is neces

sary,
follow
the procedure given in Par. Q-5. Loose
bearings
will
cause sidewise shake that is evident

around
the entire circumference of the wheel. A shake that is evident only when gripping the
wheels
in
a plane parallel to the ground, but not evident

around
the entire circumference, probably indicates
looseness
in the steering linkage.

Q-5.
Front Wheel Bearing Adjustment
With
the vehicle on the
jack,
the following proce

dure
should be followed to adjust the front wheel
bearings on four wheel-drive vehicles.
a. Remove the hub cap, snap
ring,
capscrews, and
washers that attach the driving
flange
to the hub.

b.
Using the
Front
Axle Shaft Drive Flange Puller

W-163,
pull
the driving flange.
c. Bend the lip of the nut lock washer so that the

locknut
and lock washer may be removed.

d.
Rotate the wheel and tighten the adjustment nut until the wheel binds.

Note:
Front
tire and wheel must be rotated by

hand
as the adjusting nut is
tightened
to ensure positive seating of the bearing.

Then
back off the adjusting nut about one-sixth
turn
making sure that wheel rotates freely without
sidewise shake.
e. Replace the lock washers and locknut. Bend
over the lock washer lip.
f.
Check
the adjustment (Par. Q-4). Reassemble the driving
flange
and hub cap. Make certain the
gasket is properly installed
between
the hub and
the flange.

•
Model DJ-5, DJ-6

On
two-wheel drive vehicles, remove the hub cap
and
the wheel retaining nut cotter pin. Rotate the
wheel and tighten the wheel retaining nut until the wheel binds.
Then
back off nut about one-sixth
turn
or more if necessary making sure wheel ro

tates
freely without sidewise shake. Replace the cotter pin and hub cap.

Q-6.
Rear
Wheel Bearing Adjustment —

Flanged
Axle Shaft

Vehicles
equipped with the
flange
type
rear
axle
shaft require no wheel bearing adjustment. The flanged axle shaft is equipped with a single row,

pre-adjusted,
tapered roller unit-bearing capable of
accepting thrust in either direction. The unit-

bearing
adjustment is built in at the factory mak
ing shimming or bearing adjustment unnecessary.

Refer
to Fig. Q-6.

Q-7.
Checking
Rear
Wheel Bearings —
Tapered
Axle

Raise
wheel on which adjustment is to be made
by placing a
jack
under the axle housing.
With
hands,
test
sidewise shake and in and out play
of the wheel. If bearings are correctly adjusted,
shake of wheel
will
be just perceptible and the 337

Page 338 of 376

JEEP DJ 1953 Service Manual
Q

WHEELS

FIG.
Q-6—REAR
WHEEL,
FLANGED
AXLE
AND
BEARING
ASSY.

1—
Retainer
Plate

2— Oil
Seal

3—
Unit
Bearing

4—
Retaining
Ring
5—
Axle
Shaft
wheel
will
tu

Q

WHEELS

FIG.
Q-6—REAR
WHEEL,
FLANGED
AXLE
AND
BEARING
ASSY.

1—
Retainer
Plate

2— Oil
Seal

3—
Unit
Bearing

4—
Retaining
Ring
5—
Axle
Shaft
wheel
will
turn
freely with no drag. If adjustment
is necessary, follow the procedure given in Par. Q-8.

Q-8.
Rear Wheel Bearing Adjustment
—
Tapered Axle

The
bearing adjusting shims are placed
between
the brake backing plate and axle flange as shown

in
Fig. Q-7.

With
wheel raised on
jack,
the following procedure
should be used to make the
rear
wheel bearing
adjustment.

a.
Remove the hub cap with hub cap puller, the
cotter pin, axle shaft nut, and washer. Remove the
wheel hub and drum with a wheel puller.

b.
Disconnect hydraulic brake line at wheel

cylinder.

c.
Remove the
bolts
holding the brake dust shield, grease and bearing retainer, and the brake backing
plate.

d.
Remove or install shims to adjust the bearings
to provide .001" to .006" [0,025 a 0,152 mm.]
end float of the axle shaft.

Note:
Before reassembly of the wheel make certain
the backing plate nuts are tight and torqued at 25 to 35 lb-ft [3,4 a 4,8 kg-m.].
e. Reassemble the wheel, adjust brakes, and check
the bearing adjustment (Par. Q-7).

0-9.
REAR WHEEL MOUNTING
—
TAPERED AXLE

Proper
axle shaft key installation is accomplished by placing the hub and drum on the axle shaft
taper and then inserting the axle shaft key in the
FIG.
Q-7—REAR
WHEEL
AND HUB
BEARING
—

TAPERED
AXLE
SHAFT

1—-Adjusting
Shims
2—Inner
Seal
3—Outer
Seal
keyway.
Never install the key in the keyway before

placing
the hub and drum assembly on the axle
shaft. Be sure that the axle shaft nut is torqued
to a minimum of 150 lb-ft. [20,7 kg-m.].
O-10.
BRAKE
DRUM
SERVICE
On
rear
wheels, the hub fits inside the brake drum
(Fig.
Q-3). On front wheels, the hub is attached
to the outside of the brake drum (Fig. Q-l). The

brake
drums are attached to the wheel hubs by
five serrated bolts. These
bolts
are also used for
mounting the wheels on the hub. To remove a

brake
drum,
press or drive out the serrated
bolts
and
remove the drum from the hub. When placing
the drum on the hub, make sure that the contacting
surfaces are clean and flat.
Line
up the
holes
in
the drum with
those
in the hub and put the drum
over the shoulder on the hub. Insert five new
serrated
bolts
through the drum and hub and drive
the
bolts
into place solidly. Place a round head of the bolt in a vise. Next, place the hub and drum
assembly over it so that the bolt head rests on it.

Then
swage
the bolt into the countersunk section of the hub or drum with a punch. The runout of
the drum face should be within .030" [0,76 mm.]
total indicator reading. If the runout is found to be greater than .030" it
will
be necessary to reset
the
bolts
to correct the condition.
0-11.
TIRE SERVICE
Refer
to Fig. Q-8.

One
of the most important factors of safe vehicle
operation is systematic and correct tire mainte nance.
Tires
must sustain the weight of a loaded vehicle, withstand more than ordinary rough serv- 338

Page 339 of 376

JEEP DJ 1953 Service Manual
Jeep
UNIVERSAL
SERIES
SERVICE
MANUAL

Q
ice, provide maximum safety over all
types
of

terrain,
and furnish the medium on which the
vehicle can be maneuvered with ease. Although
there a

'Jeep'
UNIVERSAL
SERIES
SERVICE
MANUAL

Q
ice, provide maximum safety over all
types
of

terrain,
and furnish the medium on which the
vehicle can be maneuvered with ease. Although
there are other
elements
of tire service, inflation maintenance is the most important and in many
instances the most neglected. The tire pressure should be maintained for safe operation. An under- inflated tire is dangerous as too much flexing can
cause breakage of the casing. Overinflation in time
may
cause a blowout.

Upon
careful inspection of tires, it may be found
that improper wheel alignment, balance, grabbing
brakes,
poor driving habits, fast cornering or other
conditions are the cause of wear. Such conditions
should be corrected.

a.
UNDERINFLATION

Underinflation
distorts the normal contour of the
tire
body and the tire
bulges
or "bellies out" with

an
extreme flexing action.
This
wears the tread at the
edges
more than the center and generates
excessive internal heat, weakening the cords and
resulting
in bruises, broken cords or ply separation.

Underinflation
also leads to rim bruises as in sufficient resistance is provided to prevent the tire

from
being jammed against the rim and crushed
or
cut when the tire strikes a
curb,
rock, or rut.

b.
OVERINFLATION

When
a tire is
overinf
lated,
increased tension caused by excessive pressure prevents proper deflection of
the sidewalls.
This
results in wear in the center of the tread and the tire also
loses
its ability to absorb

road
shocks. Under this increased
strain,
cords in the tread area eventually snap under impact, causing a casing break.

c.
MISALIGNMENT
WEAR
Excessive
wheel camber causes the tires to run at an angle to the road when camber is incorrect

it
will
cause excessive wear on one side of the
tire
tread.

Front
wheels should be straight ahead or toe-in slightly. When there is excessive toe-in or
toe-out,

tires
will
revolve with a side motion and scrape
the tread rubber off.
Front
tires
will
show wear on the outside with too great a toe-in condition
and
on the inside with a
toe-out
condition.

d.
BALANCE
Cupping
and bald spotting of tires is associated

with
wear on a vehicle driven mostly at high-way
speeds
without the recommended tire rotation and

with
unbalance conditions.

Q-12.
Tire
Care
Note;
For satisfactory 4-wheel drive operation, a
4-wheel drive vehicle
MUST
be equipped with the same size tires of equal circumference on all
four wheels. The tires must then be inflated to

proper
factory recommended pressures at all times.

Tire
pressure, tire rotation, wheel balance, and wheel alignment are the four vital factors that in
fluence the
extent
of tire life and the
ease
and safety of vehicle control.
Four
of the most common

tire
troubles are:

a.
Excessive wear around the outer
edges
resulting

from
underinflation.

b.
Excessive wear in the center of the tread re
sulting from overinflation.

c.
Tire
tread worn on one side indicating wheels
need realigning.
d.
Cuplike
depressions on one side of the tread

indicating
wheels need balancing.

If
the vehicle normally carries a
full
load, two to
four psi. [0,14 a 0,28 kg-m2] can be added to the
recommended air pressures. But, remember that adding air with a light load means a harsher ride,

doesn't
help tires, and wears out shock absorbers. Rotate the tires as shown in Fig. Q-9 for correct
rotation system.

Q-13.
Tire
Removal
and
Installation

To
remove a tire from a drop center rim, first
WEAR
AT SHOULDERS

WEAR
AT CENTER

WEAR
ON ONE
SIDE
FEATHERED
EDGE
BALD
SPOTS

/1TTDN

i

UNDER
INFLATION
OVER
INFLATION
EXCESSIVE
CAMBER

INCORRECT
TOE
WHEEL
UNBALANCED

liF
11

ADJUST
PRESSURE TO
SPECIFICATIONS
WHEN
TIRES ARE
COOL
ADJUST
CAMBER
TO

SPECIFICATIONS
ADJUST
FOR

TOE-IN
DYNAMIC
OR
STATIC

BALANCE
WHEELS

FIG.
Q-8—TIRE
WEAR
PATTERN
339

Page 351 of 376

JEEP DJ 1953 Service Manual
Jeep
UNIVERSAL
SERIES
SERVICE
MANUAL

T
BODY

Contents

SUBJECT
PAR.

Brake
and
Clutch
Pedal Pads T-7

Canvas
Tops T-5
Care
of
Fabric
Tops. : T-6

Front
Seat Adjustment. . . T

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