Ford Thunderbird 1966 - Manual Bleeding

PART
2-1
-GENERAL
BRAKE
SERVICE
25
The
hydraulic system can
be
bled
manually
or with
pressure
bleeding
equipment.
With
disc
brakes,
more
pumping
of
the pedal
is
required
and more
frequent
checking
of
the master
cylinder
may
be
necessary
while
bleeding.
Remove the
front wheel and tire as
semblies in
order
to
gain access
to
the
bleeder
fittings on the
disc
brake
calipers.
MANUAL
BLEEDING
Bleed the
longest lines
first.
Keep
the master
cylinder
reservoir filled
with new
Rotunda R103-A
Extra
Heavy Duty
brake fluid
during
the
bleeding
operation.
Never use
brake
fluid which has
been drained from the hydraulic
sys
tem.
1.
Position a
specially
formed
3/8-inch box
wrench on
the
bleeder
fitting
on the
right
rear brake
wheel
cylinder (Fig. 4).
Attach a rubber
drain tube to
the bleeder
fitting. The
end of
the tube should
fit
snugly
around
the
bleeder fitting.
APPROXIMATELY
45
HI
300-
A
FIG.
4
-Brake
Bleeder Wrench
2.
Submerge
the
free
end
of the
tube
in a
container
partially
filled
with
clean
brake
fluid,
and
loosen the
bleeder
fitting
approximately
3/4
turn.
3.
Push the brake
pedal down
slow
ly
thru
its
full travel. Close
the
bleeder
fitting,
then
return the
pedal
to
the
fully-released
position.
Repeat
this
operation
until air
bubbles
cease to
appear at
the
submerged
end
of
the
tube.
4.
When
the
fluid
is
completely
free
of air
bubbles,
close the
bleeder
fitting
and
remove the
drain tube.
5. Repeat
this
procedure
on
the
brake
cylinders
or disc
calipers
at
each
wheel
in
order: left
rear,
right
front,
and
left
front.
Refill the
master
cylinder
reservoir
after each
brake
cylinder
is
bled
and when the
bleeding
operation
is
completed.
The fluid
level
should be
within
3/8
inch of the
top
of the
reservoir. The
diaphragm-type
gasket
should be
properly
positioned
in the
reservoir
cap
before
the
cap
is
installed.
6.
Be
sure that the front
brake pis
tons
are
returned
to
their normal
positions and
that
the shoe
and
lining
assemblies are
properly
seated.
7. Before
driving
the
car,
check the
operation of the
brakes and
be sure
that
a firm
pedal
is
obtained.
PRESSURE BLEEDING
Bleed the longest
lines
first. Never
use brake fluid
which has
been
drained from the
hydraulic system.
The
bleeder tank
should
contain
enough
new
heavy-duty
brake
fluid
to
complete the
bleeding
operation,
and
it should be
charged
with
10-30
pounds
of air pressure.
1.
Clean
all
dirt
from
the master
cylinder reservoir cap.
2.
Remove the master cylinder res
ervoir
cap,
install an adapter
cap
to
the
reservoir,
and attach the bleeder
tank hose
to the
fitting
on the
adapter
cap.
An
adapter
cap
can
be
fabricated
by
cutting
a
hole
in
the
center
of a
res
ervoir
cap
and
soldering
a
fitting
at
the
hole.
The
adapter
cap
must
be
se
curely
seated
and
completely
sealed
on
the
master
cylinder
or
leakage
will
occur.
3.
Position a
3/8-inch
box
wrench
on the
bleeder
fitting
on
the
right
rear
brake
wheel
cylinder
(Fig.
4).
Attach
a
rubber
drain
tube to
the
bleeder
fit
ting.
The
end
of
the
tube
should
fit
snugly
around the
bleeder
fitting.
4.
Open
the valve
on
the
bleeder
tank to
admit
pressurized
brake
fluid
to
the master
cylinder
reservoir.
5. Submerge
the
free
end
of
the
tube
in a
container
partially
filled
with
clean
brake
fluid,
and
loosen
the
bleeder
fitting.
6.
When air
bubbles
cease to
ap
pear in
the fluid at
the
submerged
end
of
the drain
tube,
close
the
bleeder
fit
ting
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 within
3/8
inch
from the
top
of
the reservoir.
Be
sure
that
the
diaphragm-type
gasket is
properly
positioned in the
res
ervoir
cap,
and
then
install the
cap.
10.
Be sure
that the front
brake pis
tons 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,
caliper
splash
shield,
and
the
shoe and
linings as
outlined
in
Part
2-2,
Section
2.
2.
Make
three
thickness
meas
urements
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
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,
re
place
all
(4)
shoe
and
linings on both
front
wheels.
3.
With
the shoe and
linings in
stalled,
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
malfunction
of
a
piston
seal.
Ordinarily,
the
clearance
should
be