1969 FORD MUSTANG warning light

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

02-02-03
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

02-02-22
Brake System

02-02-22

BRAKE VACUUM BOOSTER -2005

AUTOMATIC I

TRANSMISSION

HAIR PIN RETAINER

330699-S2

SPACER

STOP LIGHT SWITCH-13480

STANDARD

TRANSMISSION
BUSHING
BUSHING

PUSH ROD

BRAKE PEDAL ASSEMBLY
CLUTCH

PEDAL

ASSEMBLY

H 1557-C

FIG. 30—Master Cylinder Installation—Power Brake-

Fairlane, Montego and Falcon

ASSIST

SPRING BRACKET CLUTCH ASSIST

\ SPRING

BRAKE PEDAL

SHAFT

CLUTCH

PEDAL

CLUTCH PEDAL

TO EQUALIZER ROD

HI643-
A

FIG. 31—Master Cylinder Installation-

Power Brake—Mustang and Cougar
6. Bleed the dual-master cylinder

and the primary and secondary brake

systems. Centralize the pressure dif-

ferential valve. Refer to H>draulic

System Bleeding and Centralizing of

the Differential Valve, Part 2-1, Sec-

tion 2 for the proper procedure.

7.
Operate the brakes several times,

then check for external hydraulic

leaks.

PRESSURE DIFFERENTIAL

VALVE AND PROPORTIONING

VALVE ASSEMBLY

REMOVAL

1.
Disconnect the brake warning

light wire from the pressure differen-

tial valve assembly switch (Figs. 17

thru 21). To prevent damage to the

brake warning switch wire connector,

expand the plastic lugs to allow re-

moval of the shellwire connector from

the switch body.

2.
Loosen the tube nuts connecting

the primary and secondary inlet and

outlet tubes at the pressure differential

valve assembly and remove the tubes.

3.
Remove the screw or screws re-

taining the pressure differential valve

assembly to the chassis and remove

the valve assembly.

4.
On disc brake equipped vehicles,

place the pressure differential valve

assembly and mounting bracket in a

vise.
Loosen the proportioning valve

tube nuts at the differential valve and

at the proportioning valve. Remove

the proportioning valve from the

mounting bracket.

5.
If the differential valve is to be

replaced, remove the brake warning

lamp switch and install the switch in

the new differential valve. The pres-

sure differential valve assembly, the

brake warning lamp switch, and the

proportioning valve are separate units

and each is serviced as a separate as-

sembly only.

INSTALLATION

1.
On disc brake equipped vehicles,

connect the proportioning valve inlet

and outlet tubes to the proportioning

valve and differential valve bodies.

Tighten the tube nuts to specification.

2.
Mount the pressure differential

valve assembly on the chassis and in-

stall the attaching screw or screws.

3.
Connect the primary and second-

ary inlet and outlet tubes to the pres-

sure differential valve assembly and

tighten the tube nuts to specifications.procarmanuals.com

02-02-30
Brake System

02-02-30

7.
Disconnect the wire lead at the

parking brake warning light switch

and remove the control assembly.

Installation

1.
Connect the wire lead to the

parking brake warning light switch.

2.
Position the control assembly to

the cowl inner side panel and install

the three attaching screws.

3.
Connect the ball-end of the park-

ing brake front cable assembly to the

control assembly, and install the hair-

pin retainer.

4.
Position the cable ball in the

notch in the brake clevis.

5.
Position the left air vent assem-

bly to the dash and instrument panels.

Install the four bolts and one nut re-

taining the air vent to the panels.

6. Check the operation of the park-

ing brake. Adjust the parking brake.

MUSTANG AND COUGAR

Removal

Refer to Fig. 36.

1.
Make sure the parking brake is

completely released,

2.
Remove all tension from the rear

cables by backing off the jam nut and

adjusting nut from the equalizer.

3.
Disconnect the wire lead at the

parking brake warning light switch (if

so equipped).

4.
Remove the parking brake front

cable ball retaining clip from the clev-

is.

5.
Remove the parking brake warn-

ing light switch and attaching screw (if

so equipped).

6. Disconnect the cable ball from

the notch in the brake clevis.

7.
Remove the three screws that at-

tach the control assembly to the left

cowl inner side panel.

8. Pull the control away from the

cowl, panel. Remove the hair-pin re-

tainer securing the front cable assem-

bly to the control assembly. Remove

the control assembly

Installation

1.
Connect the ball-end of the park-

ing brake front cable assembly to the

control assembly, and install the hair-

pin retainer.

2.
Position the control assembly to

the cowl inner side panel and install

the three attaching screws.
3.
Position the parking brake warn-

ing light switch and install the attach-

ing screw. Connect the parking brake

warning light switch wire lead (if vehi-

cle is so equipped).

4.
Position the cable ball in the

notch in the brake clevis.

5.
Check the operation of the park

ing brake. Adjust the parking brake.

THUNDERBIRD AND

CONTINENTAL MARK III

Removal

Refer to Fig. 37.

1.
Remove the two nuts retaining

the control to the dash panel.

2.
Remove two screws from the left

scuff plate.

3.
Remove one screw retaining the

left cowl trim panel and remove the

panel.

4.
Remove the two screws retaining

the left air duct and remove the air

duct.

5.
Remove the two screws retaining

the dimmer switch and position the

switch out of the way.

6. Remove the clip retaining the

cable assembly to the control.

7.
Disconnect the cable ball from

the control clevis.

8. Disconnect the vacuum hose at

the brake release.

9. Remove the bolt retaining the

control to the cowl side bracket and

remove the control.

Installation

1.
Position the parking brake con-

trol in the vehicle.

2.
Install the cable assembly in the

control and connect the cable ball to

the control clevis.

3.
Install the clip retaining the

cable to the control.

4.
Install the bolt retaining the con-

trol to the cowl side bracket.

5.
Connect the vacuum hose to the

parking brake release vacuum motor.

6. Position the dimmer switch and

install the retaining screws.

7.
Position the air duct and install

the retaining screws.

8. Position the cowl trim panel and

install the retaining screw.

9. Install the two scuff plate screws.

10.
Install the two nuts retaining

the control to the dash panel.

11.
Adjust the parking brakf
LINCOLN CONTINENTAL

Removal

Refer to Fig. 38.

1.
Raise the vehicle on a hoist.

2.
Loosen the parking brake cable

adjusting nut, remove the return

spring and remove the cable ball end

from the equalizer.

3.
Lower the vehicle.

4.
Disconnect the battery.

5.
Disconnect the wire harness con-

nector and two vacuum hoses at the

Automatic Temperature Control box.

6. Working inside the vehicle, re-

move the windshield wiper control

knob and bezel from the lower control

panel.

7.
Remove the screws retaining the

lower control panel. Lower the control

panel and disconnect wire harnesses

and vacuum hoses. Position the con-

trol panel aside.

8. Remove the screw retaining the

plastic wire cover and place 'the cover

aside.

9. Disconnect three vacuum hoses

and the wiring harness at the Auto-

matic Temperature Control box.

10.
Remove the two screws retain-

ing the Automatic Temperature Con-

trol box to the dash panel and remove

the box for clearance.

11.
Disconnect the ball end of the

cable from the control clevis.

12.
Remove the four bolts retaining

the control to the dash panel and

lower instrument panel flange.

13.
Disconnect the vacuum release

hose from the control and remove the

control assembly from the vehicle.

Installation

1.
Position the control assembly to

the dash panel and instrument panel

flange and install the four retaining

screws.

2.
Connect the vacuum release hose

to the control assembly.

3.
Connect the cable ball to the

control clevis.

4.
Position the Automatic Temper-

ature Control box to the dash panel

and install the retaining screws.

5.
Connect the wiring harness and

vacuum hoses to the Automatic Tem-

perature Control box.

6. Position the plastic wire covei

and install the retaining screw.

7.
Connect the wire harnesses and

vacuum lines to the lower control

panel and position the panel to the inprocarmanuals.com

02-02-38
Brake System

02-02-38

2.
Disconnect the actuator solenoid

and warning switch harness connectors

from the control module.

3.
Remove the two wiring harness

grommets from the dash panel and

push the wiring harness and connec-

tors through the openings in the dash

panel.

4.
Working in the engine compart-

ment loosen the hose clamp and re-

move the air hose from the air filter.

5.
Remove the engine air cleaner-

Loosen the hose clamp and remove

the vacuum hose from the vacuum

manifold fitting.

6. Raise the vehicle on a hoist.

7.
Disconnect the exhaust pipes

from the exhaust manifold and sup-

port with wire to provide access to the

actuator assembly.

8. Remove the bolt retaining the

actuator ground wire to the rear outer

corner of the engine right bank.

9. Loosen the tube nuts and discon-

nect the brake system hydraulic tubes

from the hydraulic valve housing.

10.
Remove the three nuts retaining

the actuator assembly to the actuator

support bracket.

11.
Remove the three bolts that re-

tain the actuator mounting bracket to

the side rail and remove the mounting

bracket.

12.
Remove the actuator assembly

from the vehicle and place it on a

bench.

13.
Remove the air and vacuum

hoses from the actuator.

INSTALLATION

1.
Install the air and vacuum hoses

on the new actuator.

2.
Place the actuator assembly into

position under the vehicle, routing the

air and vacuum hoses up between the

engine and fender apron and inserting

the solenoid leads through the holes in

the firewall.

3.
Position the ground wire to the

rear of the engine block and install re-

taining bolt.

4.
Position the actuator mounting

bracket to the frame side rail and in-

stall the three retaining bolts.

5.
Position the actuator assembly

to the mounting bracket and install

the three retaining nuts.

6. Connect the hydraulic tubes to

the hydraulic valve assembly and

tighten the tube nuts to specifications.

7.
Connect the exhaust pipes to the

exhaust manifolds.

8. Lower the vehicle.

9. Pull the actuator solenoid and

brake warning switch wiring harness
through the two holes in the dash

panel from inside the car. Seat the

wiring harness grommets in the dash

panel.

10.
Connect the actuator solenoid

and brake warning switch wiring har-

ness connectors to the control mo-

dules.
'

11.
Position the control module in

the bracket under the glove box and

install the retaining screw.

12.
In the engine compartment con-

nect the air hose to the air filter and

position the hose clamp.

13.
Connect the vacuum hose to the

engine vacuum manifold fitting. In-

stall the engine air cleaner.

14.
Bleed the rear brake system and

centralize the pressure differential

valve.

15.
Raise the rear wheels. Apply

the brakes with the rear wheels turn-

ing to verify proper operation of the

anti-skid control system.

ANTI-SKID CONTROL MODULE

REMOVAL

Refer to Fig. 39.

1.
Remove the retaining strap hold-

ing the harnesses.

2.
Remove the screw that attaches

the forward end of the control module

retainer to the support assembly.

3.
Lower the forward end of the

control module and retainer from the

support assembly; move the module

and retainer forward slightly until the

flange clears the slot in the support

assembly.

4.
Disconnect the five wiring har-

ness plugs from the control module.

5.
Remove the control module from

the vehicle.

INSTALLATION

1.
Connect the five wiring harness

plugs to the control module. Only one

arrangement is possible.

2.
Position the control module in

the retainer, orienting the module per

the markings on it, and insert the re-

tainer flange into the slot at the rear

of the support assembly.

3.
Pivot the retainer and control

module upward and align the screw

hole in the forward end of the retainer

with the hole in the support bracket

assembly. Install the retaining screw.

4.
Test the vehicle on the hoist to

verify correct operation of the skid

control system.
5.-
Secure the wiring to the module

support extension with the retaining

strap.

ANTI-SKID CONTROL SENSOR

REMOVAL

Refer to Fig. 39.

1.
Raise the vehicle on a hoist.

2.
Remove the rear wheel and tire

assembly.

3.
Remove the three Tinnerman

nuts (3) and remove the brake drum.

4.
Disconnect the sensor lead from

the rear wiring harness.

5.
Unseat the sensor lead grommet

pushing it to the inside of the brake

assembly.

6. Remove the four nuts that retain

the sensor to the backing plate and

pull the axle shaft, sensor assembly

and wheel bearing assembly from the

axle housing.

7.
Press the wheel bearing retainer

and wheel bearing off the axle shaft

(Refer to Part 4-2).

8. Remove the sensor assembly and

press the rotor off the shaft with tool

T69P-2B384-A Detail 2 and TOOL

1225-DA.

INSTALLATION

1.
Press a new rotor onto the axle

shaft. Install a new sensor assembly

on the shaft with tool T69P-

2B384-ADetail 1 and TOOL 1225-

DA, and press the bearing and bear-

ing retainer onto the shaft (Refer to

Part 4-2).

2.
Insert the axle shaft assembly in

the rear axle housing onto the four

backing plate retaining bolts, feeding

the sensor lead through the hole in the

backing plate.

3.
Seat the sensor lead grommet in

the backing plate.

4.
Install the four nuts on the re-

taining bolts and tighten to specifica-

tions.

5.
Connect the sensor lead to the

rear wiring harness and install two re-

taining straps.

6. Install the rear brake drum and

retain with the Tinnerrhan drum re-

taining nuts.

7.
Install the rear wheel and tire as-

sembly and tighten the wheel nuts to

specifications.

8. Test the vehicle on the hoist to

verify proper operation of the skid

control system.procarmanuals.com