Ford Thunderbird 1966 - Front Disc Brake Shoe and Lining Replacement

2-10
GROUP
2 -BRAKES
neutral
or
park
position
with
the
en
gine
running,
or in
any
position
with
the
engine off.
The
parking
brake control
assembly
is
mounted
to the
left cowl
side panel
(Fig.
18).
The
pedal
assembly
pivots
on a
stationary
pedal
mount (Fig.
5).
A
spring-loaded pawl
and a
release
lever
are
assembled
to the
pedal. A
ratchet is
assembled to the
stationary
mount.
The
pawl
contacts the
ratchet
at such an
angle
that
it will
slide
over
the
ratchet
teeth
as the
pedal
is
depressed;
however,
when
the
apply
ing
motion
stops
and the
pedal
starts
to
release,
the pawl
engages
the
ratchet
and thus
locks the
brakes in
the
applied
position. Since
the
release
lever
pivots against the
pawl,
a
slight
movement
of
the release lever will
dis
engage
the pawl from
the ratchet al
lowing
the
brakes to release. The
release lever
is actuated
by
a manual
release handle which
is connected
to
the lever
through
a slot and
rivet
pin
(Fig.
5).
The
vacuum power
unit
with
mounting
bracket is riveted to
the
control
assembly. The vacuum
actuat
ed
piston
within the
unit is
connected
by
a
link to the upper end of
the
release
handle which actuates the
release lever to move the
pawl
out
of
engagement with
the ratchet (Fig.
5).
The lower
end
of the
release
handle
extends out for alternate
manual
release
in the
event
of
vacuum
power
failure or for optional manual release
at
any
time.
Hoses
connect
the power
unit and
the engine
manifold to a
vacuum
release
valve in
the
transmission
neutral
safety
switch
(Figs. 5
and
6).
Moving
the
transmission selector
lever
into
any
drive position
with the
engine
running
will
open
the
release valve
to
connect engine
manifold vacuum
to
one side
of
the
actuating
piston in
the
power unit.
The
pressure
differential
thus
created
will
cause
the
piston and
link
to
pull
the
manual
release
handle
which,
in
turn,
actuates the
release
lever.
TO
VACUUM
POWER
UNIT
CONNECTS
WITH
VENTILATION
SYSTEM
NEUTRAL
SAFETY
SWITCH
(VACUUM
RELEASE
VALVE)
4
TO
ENGINE
MANIFOLD
VACUUM
H1313-A
FIG.
6
Connections
For
Auto
matic
Parking
Brake
Release
IN-CAR
ADJUSTMENTS AND
REPAIRS
After
any
brake service
work,
ob
tain a firm
brake pedal before
moving
the car.
Riding
the brake pedal (com
mon on left foot
applications)
should
be
avoided when
driving
the
car.
FRONT
(DISC)
BRAKE
SHOE
AND LINING
REPLACEMENT
REMOVAL
1.
Remove the
wheel and tire
from
the
hub and rotor
assembly.
Be
careful to
avoid
damage or in
terference
with
the
caliper splash
shield,
bleeder
screw
fitting
or
transfer
tube.
2. Remove
the two
bolts
that at
tach
the
caliper
splash
shield,
and
re
move
the
shield
(Fig.
1).
3. To
facilitate
removal
and
instal
lation
of
the shoe and
lining
as
semblies,
the
pistons
must be
pushed
into
their
bores.
Apply
a
steady
in
ward
pressure
against
each
shoe
and
lining
assembly
toward its
respective
caliper
housing
on
each side
of
the
rotor
(Fig. 2).
Maintain ihe
pressure
for
at
least a
minute.
If the
pistons
will
not go
in
easily,
force them
in
with
water
pump
pliers.
4.
Grasp
the
metal
flange on the
outer
end
of
the shoe
with two
pairs
of
pliers and
pull
the shoe
out
of
the
caliper (Fig.
7).
USE SECOND
PAIR
OF
PLIERS
HERE
H
1366
-
A
FIG.
7
Removing
Disc Broke
Shoe
and
Lining Assembly
CLEANING
AND INSPECTION
When
the
shoe and
lining
as
semblies
are
replaced,
remove the
dust
boots
from
the pistons. Check
the
condition
of
the
boots,
and inspect
each
piston
surface
for damage or
cor
rosion.
Thoroughly
clean
each
dust
boot and
surrounding
area before
in
stalling.
INSTALLATION
1. Position
a
new
shoe and
lining
assembly
on each side of the
rotor
so
that
the
lining
faces the
rotor. Be sure
that the tabs on the shoe flanges seat
fully
against
the caliper bridges
(Fig. 7).
2. Install the caliper splash
shield
and
secure the shield to the
caliper
with
two
attaching
bolts
(Fig.
1).
3.
Pump
the
brake pedal several
times
until
a firm
pedal
is obtained
and the
shoe
and
lining
assemblies are
properly
seated.
4. Install
the wheel and tire on
the
hub
and rotor assembly.
5.
Check
and refill
the master
cylinder
reservoir with
specified
brake
fluid as
required.
6.
Road test the car.
It
should not be
necessary
to bleed
the
system after
a shoe and
lining
re
placement.