Ford Thunderbird 1965 - Brake Component Cleaning and Inspection

2-6
GROUP
2
-BRAKES
end
of
the
drain
tube,
close the
bleeder
fitting
and
remove
the
tube.
7.
Repeat
this
procedure
on
the
brake
cylinder
or
disc
caliper
at
each
wheel
in
order:
left
rear,
right
front,
and
left
front.
Refill
the
master
cylinder
reservoir
after
each
brake
cylinder
is
bled.
8.
When
the
bleeding
operation
is
completed,
close
the bleeder tank
valve and
remove
the
tank hose
from
the
adapter
fitting.
9.
Remove
the
adapter
cap,
refill
the
master
cylinder
reservoir to
with
in
Yh
inch from the
top
of the res
ervoir.
Be
sure that
the
diaphragm-
type
gasket is
properly
positioned
in
the
reservoir
cap,
and
then install
the
cap.
10. Be sure
that the front
brake
pistons
are
returned
to
their
normal
positions and
that the
shoe
and
lining
assemblies
are
properly
seated.
11.
Before
driving
the
car,
check
the
operation of the
brakes
and be
sure
that
a
firm pedal
is
obtained.
CLEANING AND
INSPECTION
FRONT
BRAKES
1.
Remove
the
wheel
and
tire
as
sembly,
caliper
splash
shield,
and
the
shoe
and
lining
assemblies
as
out
lined in
Part
2-2,
Section 2.
2.
Make
three
thickness measure
ments
with
a
micrometer
across
the
middle
section
of
the
shoe and
lin
ing.
Take
one
reading
at each
side
and
one in
the
center.
If
the
as
sembly
has
worn
to a
thickness of
0.195
inch
(shoe
and
lining
to
gether)
or
0.030
inch
(lining
ma
terial
only)
at
any
one of
the
three
measuring
locations,
replace all
(4)
shoe and
lining
assemblies on both
front wheels.
3. With
the shoe and
lining
as
semblies
installed,
insert a feeler
gauge between
the
lining
and rotor.
If the
clearance
is not
within
0.002-
0.010
inch,
check
for
shoe and
lining
assemblies
not
being
properly
seated on the
caliper
bridges,
for a
piston pushed back
in
the
cylinder
bore,
for a seized
piston,
or
for
mal
function of
a
piston seal.
Ordinarily,
the
clearance
should
be
0.002-0.010
inch.
However,
if
the
Vehicle was
stopped
by
a
brake
ap
plication
just
prior to
checking
the
clearance,
the
brakes
may
drag
slightly.
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
contacts the
rotor
at a
point
approxi
mately
1
inch
from
the
outer edge.
Rotate
the
rotor
and
take
an
indi
cator
reading.
If
the
reading
exceeds
0.002
inch
total
indicator
runout,
re
place
the
rotor.
Do
not
attempt
to
refinish
a
rotor that
indicates
run
out
in
excess
of
specification.
When
the
runout check is
finished
be
sure
to
adjust
the bearings as
outlined
in
Group
3,
in
order to pre
vent
bearing
failure.
6. Check
the
rotor
for scoring.
Minor
scores can be
removed
with a
fine
emery
cloth.
If the
rotor is
ex
cessively
scored
replace
it.
7.
Visually
check
the
caliper.
If
it
is
cracked or
if
excess leakage is
evident,
it
should be
replaced.
Slight
leakage or
seized
pistons
indicate
removal and
disassembly.
8. If upon
disassembly
the caliper
is
found
to be
distorted or
damaged,
or
if
the cylinder
bores are scored
or
excessively
worn,
replace
the
as
sembly.
The two
halves of
the
caliper
assembly
should
never
be sepa
rated.
Damage or
failure of
one
requires
replacement
of
both
as a
unit.
REAR
BRAKES
1.
Remove
the
wheel
from
the
drum,
and
remove the
drum
as
out
lined
in Part
2-2,
Section 2.
Wash
all
the
parts except
the
brake
shoes
in a
cleaning
fluid
and
dry
with
com
pressed
air.
2. Brush all dust
from
the carrier
plate and
interior of
the
brake drum.
3. Inspect
the
brake
shoes for
ex
cessive
lining
wear or
shoe damage.
If
the
lining
is worn
to
within
Vx2
inch
of the rivet
heads
or if
the
shoes
are
damaged,
they
must
be replaced.
Replace
any
lining
that
has
been
oil
saturated.
Replace the
lining
in
axle
sets. Prior
to
replacement
of the
lining,
the
drum
diameter
should
be
checked
to
determine if
oversize
lin
ings must be
installed.
4. Check the
condition of the
brake
shoes,
retracting
springs,
and
drum
for
signs
of overheating.
If the
shoes have a slight blue
coloring,
or
if
the springs
show a
change
in
free
length,
indicating
overheating,
re
placement
of
the
retracting
and hold
down
springs is
necessary. Over
heated
springs
lose
their
pull and
could cause the new
lining
to
wear
prematurely
if
they
are
not
replaced.
5.
If
the
car
has 30,000 or
more
miles of
operation on
the
brake
linings,
or
signs
of
overheating
are
present
when
relining
brakes,
the
wheel cylinders
should
be disassem
bled and inspected for
wear
and dirt
in the
cylinder.
The
cylinder
cups
and other
parts
contained
in
the
overhaul kit should
be
replaced,
thus
avoiding
future problems.
6.
Inspect
all other
brake parts
and replace
any
that are worn
or
damaged.
7. Inspect the brake
drums
and,
if
necessary,
refinish. Refer
to Part
2-2,
Section
4
for
refinishing.
BOOSTER
UNIT
Clean all
metal
parts in a
suitable
solvent. After
the
metal
parts have
been
thoroughly
cleaned,
those parts
which
came in contact
with
brake
fluid
should be
re-washed in
alcohol.
Wash
all
plastic
parts and
the rubber
center
plate
seal
in
alcohol. Blow
out
dirt and
cleaning
solvent from
all
recesses
and
internal
passages.
When
overhauling
the
booster,
use
all
parts
furnished in
the repair
kit.
Discard
all
old
rubber
parts ex
cept
the
center
plate
seal
which
is
not
replaceable.
Inspect
all
parts
and
replace
those
parts
that
are
damaged,
worn
or
chipped.
If
the
hydraulic
cylinder
bore
is
scored,
rusted,
pitted
or
etched,
replace it.
If the
center
plate
or
seal
is
defective or
damaged,
re
place
the
plate
and seal
assembly.