Ford Thunderbird 1964 - Brake Booster Trouble Diagnosis Guide; Common Adjustment and Repairs; Parking Brake Linkage Adjustment; Master Cylinder Push Rod Adjustment

PART
2-1
GENERAL
BRAKE
SERVICE
2-3
BRAKE
BOOSTER
TROUBLE
DIAGNOSIS GUIDE
BOOSTER
INOPERATIVE-
HARD
PEDAL
If
the
preliminary
tests
show
that
condition.
Repair
or
replace
parts
the booster
is
inoperative or if
a
as
necessary.
hard pedal condition still
exists
after
If
the
foregoing
procedure
does
eliminating
the
causes
of
"Hard
not
eliminate the
trouble,
remove
the
Pedal"
listed in Table
1,
the
trouble
booster
from the
car.
Separate
the
u a u ii
booster
body
from the
end
plate,
and
may
be caused
by
vacuum
leakage.
uuuawuvuji
>
,
,
.
'
,
,.
*
check the
bellows,
booster
body,
and
Disconnect the vacuum line at
the ,.
,
,
, c
,
'
.Unt
diaphragm
assembly
for
damage
that
booster,
remove
the
vacuum
mam-
wou]d
came leaks
When
assembling>
fold
and check valve
assembly,
and
be
sure
that
the
diaphragm
assembly
look for a
sticking
or
faulty
check
is
pr0perly
positioned.
Improper
lo-
valve.
Check
all vacuum connections
cation
cause
leakage
between
for leakage or obstruction. Check
the
vacuum
and
atmospheric
sides
all hoses for a
leaking
or
collapsed of
the
diaphragm.
\
BRAKES
DRAG
OR
GRAB
If the
brakes still
drag
or grab valve
plunger
assembly.
Remove and
after
eliminating
the
causes
listed
in
disassemble
the booster.
Clean,
in-
Table
1,
the
condition is
probably
spect,
and
replace parts as
necessary.
caused
by
a
sticking
or damaged
SELF
APPLICATION OF
BRAKES
WHEN
ENGINE
STARTS
Remove and disassemble
the seated
atmospheric
valve.
Clean,
in-
booster. Check
the
diaphragm for
spect,
and replace parts as
neces-
being
out of
locating
radii in the
sary.
Be sure that the
diaphragm
is
housing.
Check for
a
sticking
or
un-
properly
located
when
assembling.
COMMON
ADJUSTMENTS AND
REPAIRS
PARKING BRAKE LINKAGE
ADJUSTMENT
Check the
parking
brake
cables
when the
brakes are
fully
released.
If the cables
are
loose,
adjust
them
as
follows:
U-CLIP
1.
Fully
release
the
parking
brake
pedal
by
pushing
down the
manual
release lever.
2. Raise
the
car.
3. Adjust
the
equalizer lever
against
the
cable
spring
on
the
pedal
LEVER-TO-CABLE
ADJUSTING
NUT
EQUALIZER LEVER
CABLES TO
REAR
WHEELS
H1307-A
FIG. 1
-Parking
Brake
Adjustments
cable
to
the dimension shown in
Fig. 1.
4.
Loosen the
adjusting
nut on
the
equalizer
rod,
and then turn
the lock
nut
in front of the
equalizer several
turns forward.
5. Depress
the
parking
brake pedal
IYa inches
from
its normal
released
position.
6. While
turning
the
rear
wheels
in
a
rearward
direction,
turn
the ad
justing
nut against the
equalizer until
a moderate
drag
is
felt (Fig.
1).
7. When the
cables are
properly
adjusted,
tighten
both nuts against
the
equalizer.
8. Release
the
parking
brake,
and
check
to make sure
that the
brake
shoes
return
to the
fully
released
position.
9. Depress the
parking
brake
pedal
two
inches.
Under
normal
conditions,
this
will
satisfactorily
hold
the car.
10. Release the
parking
brake
again,
and
then
depress the
pedal
Vi
inch.
The
brakes should
not
drag
with the
pedal
depressed
Vi
inch.
MASTER
CYLINDER
PUSH
ROD
ADJUSTMENT
The
push rod
is
provided
with
an
adjustment
screw
to
maintain
the