Ford Thunderbird 1964 - PART 2-2 BRAKE SYSTEM

2-6
PART
2-2
BRAKE
SYSTEM
Section
Page
1
Description
and
Operation
2-6
2
In-Car
Adjustments and
Repairs 2-9
Section
3 Removal
and
Installation
4 Major
Repair Operations
Page
.2-14
.2-16
DESCRIPTION
AND OPERATION
HYDRAULIC
SELF-ADJUSTING
BRAKE
SYSTEM
The
hydraulic
brake
system em
ploys
single
anchor,
internal
expand
ing
and
self-adjusting
brake assem
blies,
and
is
powered
by
a
vacuum
booster.
The master cylinder converts
phys
ical force from
the brake
pedal
and
booster into
hydraulic
pressure
against
the pistons
in the
wheel
cyl
inders.
The wheel
cylinder
pistons
in
turn convert
hydraulic
pressure
back into
physical force at
the brake
shoes.
The
self-adjusting
brake mechan
ism
consists of
a
cable,
cable
guide,
adjusting
lever,
adjuster
spring,
and
adjuster
screw
(Fig. 1).
The
cable
is
hooked over the anchor
pin
at
the
top
and is
connected to
the lever
at
the
bottom. The cable is
con
nected to the
secondary
brake shoe
by
means of
the
cable
guide.
The
adjuster
spring
is
hooked to
the
primary
brake shoe and to
the lever.
The
automatic adjuster
operates
only
when the brakes
are
applied
while the car is
moving
rearward
and
only
when the
secondary
shoe
is
free
to move
toward the
drum
beyond a
predetermined
point.
With
the car
moving
rearward
and
the
brakes
applied,
the
"wrap
around"
action of the shoes
follow
ing
the
drum forces
the
upper
end
of
the
primary
shoe against
the
anchor
pin. The
action
of the
wheel
cylinder
moves
the
upper end
of
the
secondary
shoe
away
from the
anchor
pin.
The movement
of
the
secondary
shoe causes the
cable to
pull the
adjusting
lever
upward
and
against
the end of
a tooth
on the
adjusting
screw
star wheel.
The
up
ward
travel of
the lever increases
as
lining
wear
increases.
When the
PARKING
BRAKE
LEVER
RETAINING
CLIP
WASHER
PARKING
BRAKE
LEVER
ANCHOR PIN PLATE
ANCHOR PIN
,
ANTI-RATTLE CLIP
FOREWARD
PRIMARY
SHOE-TO-ANCHOR
SPRING
SHOE
HOLD-DOWN
SPRINGS
CABLE
HOOK
PARKING
BRAKE
CABLE
HOUSING
RETAINER
SHOE
HOLD-DOWN
SPRINGS
PRIMARY
SHOE
AUTOMATIC
ADJUSTER
SPRING
PARKING
BRAKE
CABLE
AND
HOUSING
PIVOT NUT
HI
1
54-C
FIG.
1
-Self-Adjusting
Brake
Assemblies