Ford Mercury Colony 1968

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PART 2-2 - Brake System

2-21

STANDARD

REAR

WHEEL CYLINDER REPAIR

Wheel cylinders should

not be

disas-

sembled unless they

are

leaking

unless

new

cups

and

boots

are to be

installed.

It is not

necessary

remove

the brake cylinder from

the

backing

plate

disassemble, inspect,

hone

and overhaul

the

cylinder. Removal

is necessary only when

the

cylinder

is damaged

scored beyond repair.

DISASSEMBLY

Remove

the

links

and the

rubber

boots from

the

ends

of the

brake

cyl-

inder. Remove

the

pistons, cups,

and

return spring from

the

cylinder bore

(Fig. 20).

Remove

the

bleeder screw from

the cylinder.

INSPECTION

Wash

all

parts

clean brake

fluid.

Dry

with compressed

air.

Replace scored pistons. Always

replace

the

rubber cups

and

dust

boots.

Inspect

the

cylinder bore

for

score marks

rust.

either condi-

tion

present

the

cylinder bore must

be honed. However,

the

cylinder

should

not be

honed more than 0.003

inch beyond

its

original diameter.

Check

the

bleeder hole

to be

sure

that

it is

open.

ASSEMBLY

Apply

light coating

heavy-

duty brake fluid

to all

internal parts.

Thread

the

bleeder screw into

the cylinder

and

tighten securely.

Insert

the

return spring, cups,

and pistons into their respective

po-

sitions

in the

cylinder bore

(Fig. 20).

Place

boot over each

end of the cyl-

inder. Bleed

the

brake system.

WHEEL CYLINDER

REPLACEMENT

REMOVAL

Remove

the

wheel

and

the drum.

Remove

the

brake shoe assem-

blies,

following procedures outlined

in this section.

Disconnect

the

brake line from

the brake cylinder Figs.

19 and

21.

a vehicle with

vacuum brake boost-

er,

sure

the

engine

stopped

and

there

is no

vacuum

in the

booster

sys-

tem before disconnecting

the

hydrau-

lic lines.

To disconnect

the

hose

at a

front

cylinder, loosen

the

tube fitting that

BOOT BOOT

CUP

FRONT BRAKE CYLINDER

CUP

BOOT

RETURN

SPRING PISTON

CUP

REAR BRAKE CYLINDER

FIG.

20—

Front

and Rear Wheel Cylinders

CUP

H 1100-B

connects

the

opposite

end of the

hose

the

brake tube

at a

bracket

on the

frame. Remove

the

horseshoe-type

retaining clip from

the

hose

and

brac-

ket, disengage

the

hose from

the

brac-

ket, then unscrew

the

entire hose

as-

sembly from

the

front wheel cylin-

der.

rear cylinder, unscrew

the

tube fitting that connects

the

tube

the cylinder.

Do not

pull

the

metal

tube away from

the

cylinder. Pulling

the tube

out of the

cylinder connec-

tion will bend

the

metal tube

and

make installation difficult.

The

tube

will separate from

the

cylinder when

the cylinder

removed from

the

back-

ing plate.

On the

rear wheel, remove

the

wheel cylinder attaching bolts

and

lock washers

and

remove

the

cylin-

der.

On the

front wheel, remove

the

nut

and

washer that attaches

the cyl-

inder

to the

anchor

pin.

Remove

the

cylinder from

the

anchor

pin.

INSTALLATION

Wipe

the

end(s)

of the

hydraulic

line

remove

any

foreign matter

be-

fore making connections.

install

front wheel cylinder,

position

the

cylinder

on the

anchor

pin against

the

backing plate.

In-

stall

the

washer

and

cylinder attaching

nut

on the

anchor

pin, and

torque

it to

specification. Lock

the

washer retain-

er securely.

Install

a new

copper gasket over

the hose fitting. Thread

the

hose into

the cylinder.

Engage

the

opposite

end of the

hose

to the

bracket

on the

frame.

In-

stall

the

horseshoe-type retaining

clip,

and

connect

the

brake tube

the hose with

the

tube fitting

nut.

Tighten

the nut to

specification with

tool 1112-144.

install

rear wheel cylinder,

place

the

rear wheel cylinder into

position. Enter

the

tubing into

the

cylinder,

and

start

the

tube fitting

nut into

the

threads

of the

cylinder.

Secure

the

cylinder

to the

backing

plate

installing

the

attaching bolts

and lock washers.

6. Tighten

the

tube fitting

nut to

specification with tool

12-144.

Install

the

links

in the

ends

the wheel cylinder, install

the

shoes

and adjuster assemblies,

and

adjust

the shoes

oulined

this section.

8. Adjust

the

brakes (Part

2-2,

Section

2).

Install

the

brake drum

and

wheel. Bleed

the

brakes

and

central-

ize

the

differential valve

outlined

in Part

2-1,

Section

BRAKE BACKING PLATE

REPLACEMENT

REMOVAL

Remove

the

wheel

and

brake

drum. Disconnect

the

brake line from

the brake cylinder.

Remove

the

brake shoe

and ad-

juster assemblies

and the

wheel

cyl-

inder

outlined

this section.

the rear wheels, disconnect

the

park-

ing brake lever from

the

cable.

If the

rear backing plate

Ford Mercury Colony 1968 - Page 29

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