1969 FORD MUSTANG Volume One Chassis

02-01-06

Brakes

02-01-06

side.
Refill the master cylinder reser-

voir after each wheel cylinder is bled

and install the master cylinder cover

and gasket. Be sure the diaphragm

type gasket is properly positioned in

the master cylinder cover. When the

bleeding operation is completed, the

fluid level should be filled to within

1/4 inch of the top of the reservoirs.

7. If the primary (front brake) sys-

tem is to be bled. Repeat steps 2

through 6 at the right front brake cal-

iper or cylinder and ending at the left

front brake caliper or cylinder.

8. On disc brake equipped models

be sure that the front brake pistons

are returned to their normal positions

and that the shoe and lining assem-

blies are properly seated by depressing

the brake pedal several times until

normal pedal travel is established.

9. Centralize the pressure differen-

tial valve. Refer to the Centralizing

the Pressure Differential Valve proce-

dures which follow.

PRESSURE BLEEDING

The Lincoln Continental hydraulic

brake system is to be bled only with

pressure bleeding equipment.

Bleed the longest lines first. The

bleeder tank should contain enough

new Ford Brake Fluid to complete the

bleeding operation. Use Ford Brake

Fluid — Extra Heavy Duty — Part

Number C6AZ-19542-A (ESA-

M6C25-A) or equivalent for all brake

applications. The brake fluid is col-

ored blue for identification purposes.

Do not mix low temperature brake

fluid with the specified brake fluid

during the bleeding operations. Never

re-use brake fluid that has been

drained from the hydraulic system.

The tank should be charged with ap-

proximately 10 to 30 pounds of air

pressure. Never exceed 50 pounds

pressure.

1.
Clean all dirt from the master

cylinder reservoir cover.

2.
Remove the master cylinder res-

ervoir cover and rubber gasket, and

fill the master cylinder reservoir with

the specified brake fluid. Install the

pressure bleeder adapter tool to the

master cylinder, and attach the bleed-

er tank hose to the fittng on the

adapter.

Master cylinder pressure bleeder

adapter tools can be obtained from

the various manufacturers of pressure

bleeding equipment. Follow the in-

structions of the manufacturer when

installing the adapter.

3.
If the master cylinder is

equipped with a bleed screw, loosen
the bleed screw and bleed the master

cylinder until the fluid is free of air

bubbles; then, tighten the bleed screw.

Do not use the secondary piston stop

screw, located on the bottom of the

master cylinder, to bleed the master

cylinder.

4.
If the rear wheel cylinders, the

secondary brake system, are to be

bled, position a 3/8 inch box wrench

(Fig. 9) on the bleeder fitting on the

right rear brake wheel cylinder. At-

tach a bleeder tube to the bleeder fit-

ting. The end of the tube should fit

snugly around the bleeder fitting.

5. Open the valve on the bleeder

tank to admit pressurized brake fluid

to the master cylinder reservoir.

6. Submerge the free end of the

tube in a container partially filled with

clean brake fluid, and loosen the

bleeder fitting.

7.
When air bubbles cease to ap-

pear in the fluid at the submerged end

of the bleeder tube, close the bleeder

fitting and remove the tube.

8. Repeat steps 3 through 7 at the

left rear wheel cylinder.

9. If the vehicle is equipped with

disc brakes, repeat steps 4 through 7,

starting at the right front disc caliper

and ending at the left front disc cali-

per.

On Lincoln Continental models the

front wheel and tire assemblies must
be removed to gain access to the

bleeder fittings on the calipers. Also

on Lincoln Continental models the

metering valve release rod must be

pulled outward and held a minimum

of 1/16 inch (Fig. 10) while bleeding

the primary brake system.

10.
If the vehicle contains drum-

type front brakes and the primary

(front) brake system is to be bled, re-

peat steps 4 through 7, starting at the

right front wheel cylinder ending at

the left front wheel cylinder.

11.
When the bleeding operation is

completed, close the bleeder tank

valve and remove the tank hose from

the adapter fitting.

12.
On disc brake equipped ve-

hicles,
be sure that the front brake

pistons are returned to their normal

positions and that the shoe and lining

assemblies are properly seated by dep-

ressing the brake pedal several times

until normal pedal travel is esta-

blished.

13.
Remove the Pressure Bleeder

Adapter Tool. Fill the master cylinder

reservoirs to within 1/4 inch of the

top.
Install the master cylinder cover

and gasket. Be sure the Diaphragm

type gasket is properly positioned in

the master cylinder cover.

14.
Centralize the pressure differen-

tial valve as follows.

METERING VALVE

BLEEDER RETAINER

SEE

VIEW A

RELEASE ROD

FIG. 10—Disc Brake Metering Valve—Lincoln Continental
HI 644-Aprocarmanuals.com

02-01-07
Brakes

02-01-07

CENTRALIZING THE

PRESSURE DIFFERENTIAL

VALVE

After a failure of the primary (front

brake) or secondary (rear brake) sys-

tem has been repaired and bled, the

dual-brake warning light will usually

continue to be illuminated due to the

pressure differential valve remaining in

the off-center position.

To centralize the pressure differen-

tial valve and turn off the warning
light after a repair operation, a pres-

sure differential or unbalance condi-

tion must be created in the opposite

brake system from the one that was

repaired or bled last.

1.
Turn the ignition switch to the

ACC or ON position. Loosen the dif-

ferential valve assembly brake tube

nut at the outlet port on the opposite

side of the brake system that was

wheel balanced, repaired and/or bled

last. Depress the brake pedal slowly to

build line pressure until the pressure
differential valve is moved to a cen-

tralized position and the brake warn-

ing light goes out; then, immediately

tighten the outlet port tube nut.

2.
Check the fluid level in the mas-

ter cylinder reservoirs and fill them to

within 1/4 inch of the top with the

specified brake fluid, if necessary.

3.
Turn the ignition switch to the

OFF position.

4.
Before driving the vehicle, check

the operation of the brakes and be

sure that a firm pedal is obtained.

CLEANING AND INSPECTION

DISC BRAKES

1.
Remove the wheel and tire and

the shoe and lining assemblies as out-

lined in Part 2-2, Section 2.

2.
On all models except Lincoln

Continental, make thickness measure-

ments with a micrometer across the

thinnest section of the shoe and lining.

If the assembly has worn to a thick-

ness of 0.230-inch (shoe and lining to-

gether) or 0.030-inch (lining material

only) at any one of three measuring

locations or if there is more than

0.125 taper from end to end or if lin-

ing shows evidence of brake fluid con-

tamination, replace all (4) shoe and

lining assemblies on both front wheels.

On Lincoln Continental brakes

make three thickness measurements

with a micrometer across the middle

section of the shoe and lining. Take

one reading at each side and one in

the center. If the assembly has worn

to a thickness of 0.231 inch (shoe and

lining together) or 0.066 inch (lining

material only) at any one of the three

measuring locations, replace all (4)

shoe and lining assemblies on both

front wheels.

3.
Check the caliper to spindle at-

taching bolts torque. Torque them to

specification, if required.

4.
To check rotor runout, first

eliminate the wheel bearing end play

by tightening the adjusting nut. After

tightening the nut, check to see that

the rotor can still be rotated.

5.
Clamp a dial indicator to the

caliper housing so that the stylus con-

tact the rotor at a point approximate-

ly 1 inch from the outer edge. Rotate

the rotor and take an indicator read-

ing. If the reading exceeds 0.003 inch

total lateral runout on the indicator,

replace or resurface the disc brake

rotor. The following requirement must

be met when resurfacing disc brake

rotors:
Rotunda Disc Brake Attachment

FRE-2249-2 is the only approved tool

to be used to refinish the disc brake

rotors.
The step-by-step resurfacing

procedure provided with the tool must

be adhered to.

The finished braking surface of the

rotor must be flat and parallel within

0.0007 inch; lateral runout must not

exceed 0.003 inch total indicator

reading, braking surface are to be 80/15

micro inches.

On all models except Lincoln Con-

tinental the minimum limiting dimen-

sion from the inboard bearing cup to

the inboard rotor face and the mini-

mum rotor thickness dimension, must

be observed when removing material

from the rotor braking surfaces. A

ball and gage bar (Rotunda Kit FRE

70160) is to be used when checking

minimum dimensions (Fig. 11).

FALCON-FAIRLANE

MUSTANG-COUGAR

MONTEGO

.046 MAX-**

.119
MAX.

FORD-MERCURY

METEOR - THUNDERBIRD
875
MIN

H1633-A

1.12
MIN.-^

??
— Disc Brake Rotor

Service Limits—All Models Except

Lincoln Continental

On Lincoln Continental models the

minimum limiting dimension (Fig. 12)

from the inboard bearing cup to the
inboard rotor face (dimension B)

and the outboard rotor surface and

the inboard bearing cup (dimension

A),
must be observed when remov-

ing material from the rotor braking

surfaces.

When the runout check is finished

be sure to adjust the bearings as out-

lined in Group 3, in order to prevent

bearing failure.

6. Check the rotor for scoring. Mi-

nor scores can be removed with a

fine emery cloth. If the rotor is ex-

cessively scored, refinish it as out-

lined in step 5 or replace the rotor,

if required.

7.
Visually check the caliper. If the

caliper housing is leaking it should be

replaced. If a seal is leaking the cali-

per must be disassembled and new

.seals installed. If a piston is seazed

in the bore a new caliper housing is

required.

On Lincoln Continental models the

two halves of the caliper assembly

should never be separated. Damage or

failure of one requires replacement of

both as a unit.

Check the brake hoses for signs of

cracking, leaks or abrasion. Replace

them if necessary.

DISC BRAKE SERVICE

PRECAUTIONS

1.
Grease or any other foreign ma-

terial must be kept off the caliper as-

sembly, surfaces of the rotor and ex-

ternal surfaces of the hub during serv-

ice operations. Handling of the rotor

and caliper assemblies should be done

in a way to avoid deformation of the

brake rotor and nicking or scratching

of brake linings.

2.
If a caliper piston is removed for

any reason, the piston seal must be re-

placed.

3.
During removal and installation

of a wheel assembly, exercise care not

to interfere with and damage the cali-procarmanuals.com

02-01-08
Brakes

02-01-08

BEARING CUP

DIMENSION "B"

0.755 MINIMUM

DIMENSION "A'

0.395 MINIMUM

H1532-B

FIG. 12—Disc Brake Rotor Service

Limits—Lincoln Continental

per splash shield or the bleeder screw

fitting.

4.
Front wheel bearing end play is

critical and must be within specifica-

tions.

5.
Be sure the vehicle is centered on

the hoist before servicing any front

end components, to avoid bending or

damaging the rotor splash shield on

full right or left wheel turns.

6. The proportioning valve should

not be disassembled or adjustments

attempted on it.

7.
Riding of the brake pedal (com-

mon on left foot applications) should

be avoided during vehicle operation.

8. The wheel and tire must be re-

moved ' separately from the brake

rotor, unlike drum brakes where the
wheel, tire and drum are removed as a

unit.

9. On floating caliper type disc

brakes whenever the caliper is re-

moved the caliper locating pins should

be inspected for wear or damage.

10.
On floating caliper type disc

brakes, the caliper assembly must be

removed from the spindle prior to re-

moval of the shoe and lining assem-

blies.

11.
On floating caliper type disc

brakes the calipers must not be inter-

changed from one side to the other.

When the caliper is installed on its

proper anchor plate and spindle, the

bleeder screw will point to the rear of

the vehicle (Fig. 22). If a caliper is in-

stalled on the wrong side of the vehi-

cle,
it is not possible to bleed the sys-

tem properly.

12.
Do not attempt to clean or re-

store oil or grease soaked brake lin-

ings.
When contaminated linings are

found, brake linings must be replaced

in complete axle sets.

DRUM BRAKES

1.
Remove the wheel from the

drum, and remove the drum as out-

lined in Part 2-2, Section 2.

2.
Brush all dust from the backing

plates and interior of the brake

drums.

3.
Inspect the brake shoes for ex-

cessive lining wear or shoe damage. If

the lining is worn within 1/32 inch of

the rivet heads or if the shoes are

damaged, they must be replaced. Re-

place any lining that had been con-

taminated with oil, grease or brake
fluid. Replace lining in axle sets. Prior

to replacement of lining, the drum di-

ameter should be checked to deter-

mine if oversize linings must be in-

stalled.

4.
Check the condition of brake

shoes,
retracting springs, hold-down

springs, and drum for signs of over-

heating. If the shoes have a slight blue

coloring, indicating overheating, re-

placement of the retracting and hold-.

down springs is strongly recommended.

Overheated springs lose their pull and

could cause the new lining i:o wear

prematurely, if they are not replaced.

5. If the vehicle has 30,000 or more

miles of operation on the brake linings

or signs of overheating are present

when relining brakes, the wheel cylin-

ders should be disassembled and in-

spected for wear and entrance of dirt

into the cylinder. The cylinder cups

should be replaced, thus avoiding fu-

ture problems.

6. Inspect all other brake parts and

replace any that are worn or dam-

aged.

7.
Inspect the brake drum and, if

necessary, refinish. Refer to Part 2-2,

Section 4 for refinishing.

BRAKE BOOSTER

Check the booster operation as

noted in Part 2-1, Section 1, Power

Brake Functional Test. If the brake

booster is damaged or defective, re-

place it with a new booster. The brake

booster is serviced only as an assem-

bly.procarmanuals.com

02-02-01
Brake System

02-02-01

Part 2-2 Brake
System

COMPONENT INDEX

ANTI SKID CONTROL SYSTEM

Description

ANTI SKID CONTROL ACTUATOR

Removal and Installation

ANTI SKID CONTROL MODULE

Removal and Installation

ANTI SKID CONTROL SENSOR

Removal and Installation

BRAKE BACKING PLATE (DRUM)

Removal and Installation

BRAKE BOOSTER

Cleaning and Inspection
-
See Part 2-1

Description

Removal and Installation

BRAKE DRUM

Cleaning and Inspection
-
See Part 2-1

Refinishing

Removal and Installation (Front)

Removal and Installation (Rear)

BRAKE PEDAL

Removal and Installation

BRAKE SHOES (DRUM)

Adjustments

Relining

Removal and Installation

DISC BRAKE

Description

DISC BRAKE CALIPER

Cleaning and Inspection

Disassembly and Overhaul

Removal and Installation

DISC BRAKE ROTOR AND HUB

Cleaning and Inspection
—
See Part 2-1

Refinishing

Removal and Installation

DISC BRAKE ROTOR SPLASH SHIELD

Removal and Installation

DISC BRAKE SERVICE PRECAUTIONS

—
See Part 2-1
MODEL APPLICATION
All
Models

02-16

02-06

02-24

02-39

02-09

02-09

02-07

02-39

02-09

02-03

02-39

02-19

02-19
Ford
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Mercury
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Meteor
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Cougar
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Fairlane
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Falcon
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Montego
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Mustang
N/A

N/A

N/A

N/A

02-09

02-25

02-41

02-41

02-16
Lincoln-
Continental
N/A

N/A

N/A

N/A

N/A

02-27

02-42

02-41

02-17
Thunderbird
02-07

02-36

02-38

02-38

N/A

02-26

04-41

02-41

02-16
Continental-
Mark
III
02-07

02-36

02-38

02-38

N/A

02-26

02-41

02-41

02-16

A page number indicates that the item is for the vehicle listed at the head of the column.

N/A indicates that the item is not applicable to the vehicle listed.
procarmanuals.com

02-02-02

Brake
System
02-02-02

COMPONENT INDEX

DISC BRAKE SHOE AND LINING

Cleaning and Inspection
-
See
Part 2-1

Removal and Installation

DRUM BRAKE

Description

DUAL BRAKE SYSTEM

Description

HYDRAULIC LINES

Removal
and
Installation (Hose)

Removal
and
Installation (Tube)

MASTER CYLINDER

Cleaning
and
Inspection

Disassembly
and
Overhaul

Removal
and
Installation - Non-Power

Removal
and
Installation - Power

PARKING BRAKE

Description

PARKING BRAKE ACTUATOR
TO

CONTROL CABLE

Removal
and
Installation

PARKING BRAKE ACTUATOR
TO

EQUALIZER CABLE

Removal
and
Installation

PARKING BRAKE CONTROL

Removal
and
Installation

PARKING BRAKE EQUALIZER
TO

CONTROL CABLE

Removal
and
Installation

PARKING BRAKE EQUALIZER
TO

REAR WHEEL CABLE

Removal
and
Installation

PRESSURE DIFFERENTIAL VALVE

Removal
and
Installation

PRESSURE METERING VALVE

Removal
and
Installation

PROPORTIONING VALVE

Removal
and
Installation

WHEELCYLINDER

Cleaning
and
Inspection

Disassembly
and
Overhaul

Removal
and
Installation
MODEL APPLICATION
All
Models

02-05

02-03

02-08

02-08

02-40

02-39

02-21

02-06

02-22

02-08

02-07

02-10
Ford
02-18

02-19

02-34

02-35

02-27

N/A

02-35

N/A

02-23
Mercury
02-18

02-19

02-34

02-35

02-27

N/A

02-35

N/A

02-23
Meteor
02-18

02-19

02-34

02-35

02-27

N/A

02-35

N/A

02-23
Cougar
02-18

02-20

N/A

N/A

02-30

02-34

02-36

N/A

02-23
Fairlane
02-18

02-20

N/A

N/A

02-27

02-34

02-36

N/A

02-23
Falcon
02-18

02-20

N/A

N/A

02-27

02-34

02-36

N/A

02-23
Montego
02-18

02-20

N/A

N/A

02-27

02-34

02-36

N/A

02-23
Mustang
02-18

02-20

N/A

N/A

02-30

02-34

02-36

N/A

02-23
Lincoln-
Continental
02-18

N/A

N/A

N/A

02-30

02-35

02-36

02-24

02-24
Thunderbird
02-18

N/A

02-34

02-35

02-30

N/A

02-35

N/A

02-24
Continental-
Mark III
02-18

N/A

02-34

02-35

02-30

N/A

02-35

N/A

02-24

A page number indicates that the item
is for
the vehicle listed
at
the head
of
the column.

N/A indicates that the item is
not
applicable
to
the vehicle listed.
procarmanuals.com

02-02-03
Brake System

02-02-03

DESCRIPTION

Disc brakes are available as option-

al equipment for the front wheels on

Ford, Mercury, Meteor, Fairlane,

Montego, Falcon, Mustang and Cou-

gar models and are standard on Thun-

derbird, Continental Mark III, and

Lincoln Continental models. The

dual-master cylinder equipped hydrau-

lic brake system employs single an-

chor, internal expanding and
self-

adjusting drum brake assemblies on

the rear wheels of vehicles with disc

brakes, and on the front and rear

wheels of all others.

A vacuum booster is used with the

power disc brake system.

DUAL MASTER CYLINDER

BRAKE SYSTEM

The dual-master cylinder brake sys-

tem has been incorporated in all mod-

els to provide increased safety. The

system consists of a dual-master cylin-

der (Fig. 1), pressure differential valve

assembly and a switch (Fig. 2). The

switch on the differential valve acti-

vates a dual-brake warning light, lo-

cated on the instrument panel.
DISC BRAKE

The disc brake consists of a venti-

lated rotor and caliper assembly. The

caliper used on all models except Lin-

coln Continental is a single piston

floating caliper (Fig. 3). The caliper

used on Lincoln Continental models is

a four piston fixed caliper (Fig. 4).

A proportioning valve in the rear

hydraulic circuit provides balanced

braking action between front and rear

brakes.

On all models except Lincoln a

pressure impulse valve located at the

primary inlet of the pressure differen-

tial valve prevents brake fluid surge

back to the master cylinder reservoir.

On Lincoln Continental models a

metering valve, in the hydraulic line

between the differential valve and the

front wheel disc brakes, prevents the

front brakes from applying until ap-

proximately 125 psi is obtained in the

system (Fig. 21). This delaying action

is required to prevent the front brakes

from performing all the braking ac-

tion on low speed stops and thereby

increasing the rate of lining wear.
FLOATING CALIPER—

ALL MODELS EXCEPT

LINCOLN CONTINENTAL

The caliper asseml.y is made up of

a floating caliper housing assembly

and an anchor plate. The anchor plate

is bolted to .the wheel spindle arm by

two bolts. The floating caliper is at-

tached to the anchor plate by steel

stabilizers on Ford, Mercury, Meteor,

Thunderbird and Continental Mark

III models and by one stabilizer on

Fairlane, Montego, Falcon, Mustang

and Cougar models. The floating cali-

per slides on two locating pins which

also attach to the stabilizers. The

floating caliper contains the single cyl-

inder and piston assembly. The cylin-

der bore contains a piston with a

molded rubber dust boot to seal the

cylinder bore from contamination

(Fig. 5). A square section rubber pis-

ton seal is positioned in a groove in

the cylinder bore and is used to pro-

vide sealing between the cylinder and

piston (Fig. 7).

The outer brake shoe and lining as-

sembly is longer than the inner assem-

bly, and the shoe and lining

DISC BRAKES

RETURN SPRING

(SECONDARY)

RETAINER

PRIMARY SYSTEM BRAKE

FLUID RESERVOIR

BOOT

PUSH ROD

TUBE SEAT |

(SECONDARY)

BRAKE OUTLET

PORT
RESIDUAL \ ^

CHECK \

VALVE \

SECONDARY PISTON

ASSEMBLY
(PRIMARY)

BRAKE OUTLET

PORT
PRIMARY PISTON

ASSEMBLY
H 1545-A

FIG.
I
—
Dual
Master Cylinder—Typicalprocarmanuals.com

BRAKE WARNING LAMP SWITCH

PISTON
BRAKE WARNING LAMP SWITCH

BRAKE WARNING LAMP SWITCH

PLUNGER IN THE ON POSITION

CONNECTOR
BRAKE WARNING LAMP SWITCH

PLUNGER IN OFF POSITION

VALVE PISTON HAS MOVED

TO LOW PRESSURE AREA.

WARNING LAMP SWITCH

PLUNGER IS DEPRESSED,

LIGHTING THE BRAKE

WARNING LAMP

LOW PRESSURE SIDE
U
VALVE PISTON IS

CENTRALIZED. PRIMARY

AND SECONDARY SYSTEM

PRESSURES ARE EQUALIZED

BRAKE WARNING LAMP

SWITCH PLUNGER IN

OFF POSITION
HIGH PRESSURE SIDE

DRUM BRAKES
TJ
CONNEiCTOR

BRAKE FLUID

BRAKE WARNING LAMP I

SWITCH PLUNGER IN

ON POSITION

REAR BRAKE INLET

CONNECTOR

FRONT BRAKE

INLET

FRONT BRAKE

OUTLET
VALVE PISTON IS CENTRALIZED.

PRIMARY AND SECONDARY SYSTEM

PRESSURES ARE EQUALIZED
OUTLET TO

PROPORTIONING VALVE

DISC BRAKES
\
REAR BRAKE

PROPORTIONING

VALVE IS BYPASSED

VALVE PISTON HAS MOVED TO LOW

PRESSURE AREA. WARNING LAMP SWITCH PLUNGER IS

DEPRESSED, LIGHTING THE BRAKE WARNING LAMP H1634-A

FIG. 2—Pressure Differential Valve and Brake Warning Light Switch

CALIPER ASSEMBLY

BLEEDER

SCREW
EXTERNAL

TRANSFERTU3E

H1567-B
HUB

AND

ROTOR

ASSEMBLY

H 1647-A

FIG. 3—Disc Brake Assembly-

Floating Caliper—All Models

Except Lincoln Continental
FIG. 4—Disc Brake Assembly—

Fixed Caliper—Lincoln

Continental
blies are not interchangable (Fig. 23).

The outboard shoe and lining is fixed

to the floating caliper and is retained

by two pins and spring clips. The shoe

and lining assembly consists of fric-

tion material bonded to a metal plate

called the shoe. It is replaced as a

unit.

FIXED CALIPER

LINCOLN CONTINENTAL

The caliper assembly is bolted di-

rectly to the wheel spindle arm by two

bolts.
The caliper assembly consists of

two caliper housings bolted together

with each half containing two cylinder

bores of 1.938 inch diameter. Each

cylinder bore contains a piston with

an attached molded rubber dust boot

to seal the cylinder bore from contam-

ination (Fig. 6). Square-section rubberprocarmanuals.com

02-02-05
Brake System

02-02-05

piston seals are positioned in grooves

in the cylinder bores and are used to

provide hydraulic sealing between the

cylinders and pistons (Fig. 7).

The cylinders are connected hydrau-

lically by means of internal passages

in the caliper housings and an external

transfer tube between the two halves

of the caliper assembly. One bleeder

screw and fluid inlet fitting is provided

on each caliper assembly.

The shoe and lining assemblies are

located in between parallel machined

abutments within the caliper, and are

supported radially by tabs on the

o'uter ends of the shoe assemblies (Fig.

46).
The shoes slide axially in the cali-

per abutments by means of the tabs

which ride on machined ledges (bridg-

es) when hydraulic pressure is applied

to the piston (Fig. 6). A shoe and lin-

ing assembly consists of friction mate-

rial riveted to a metal plate called the

shoe.
It is replaced as a unit. Clips are

attached to the top of the caliper to

retain the shoe and lining assemblies.

The caliper assembly is mounted on

the front wheel spindle to the rear of

the wheel vertical centerline.

ROTOR

The cast iron disc is of the ventilat-

ed rotor-type incorporating forty fins

and is attached to, and rotates with

the wheel hub. A splash shield bolted

to the spindle is used primarily to pre-

vent road contaminants from contact-

ing the inboard rotor and lining sur-

faces.
The wheel provides protection

for the outboard surface of the rotor.

DRUM BRAKE

The drum brake system employs

single anchor, internal expanding ancj

self adjusting brake assemblies.

The self-adjusting brake mechanism

consists of a cable, cable guide, ad-

justing lever, adjusting screw assem-

bly, and adjuster spring (Fig. 8). The

cable is hooked over the anchor pin at

the top and is connected to the lever

at the bottom. The cable is routed

along the webb of the secondary brake

shoe by means of the cable guide. The

adjuster spring is hooked to the pri-

mary brake shoe and to the lever. The

automatic adjuster operates only when

the brakes are applied while the vehi-

cle is moving rearward and only when

the secondary shoe is free to move

toward the drum beyond a predeter-

mined point.
CALIPER
HOUSING

PISTON

SHOE

LINING

PISTON SEAL

FIG. 5—Floating Caliper Assembly—Sectional View

CALIPER
TO
ROTOR
CLEARANCE

CALIPER
HOUSING

PISTON

SHOE

LINING

PISTON SEAL
H 1568-B

TRANSFER
TUBE

PISTON DUST BOOT

RETAINING
GROVE

CALIPER
DUST

BOOT
RETAINER

H 1648-A

FIG.
6—Fixed
Caliper Assembly—Sectional View

PISTON
PISTON SEAL
RELAXED

CALIPER
HOUSING

BRAKES APPLIED

FIG. 7—Function of Piston Seal
BRAKES RELEASED

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