1969 DATSUN 610 USB

BrakIng

System

DESCRIPTION

MASTER
CYLINDER
Removal

dismantling
and
Overhaul

BRAKE
LINES

Replacing

BRAKE
WARNING
LIGHT
SWITCH

FRONT
DRUM
BRAKE
Removal

inspection
and
Overhaul

REAR
DRUM
BRAKE
Removal

inspection
and
Overhaul

FRONT
DRUM
BRAKE

Adjusting

DESCRIPTION

The
vehicle
is
fitted
with
either
disc

brakes
or
two

leading

shoe

type
drum
brakes
for
the
front
wheels
and

leading
trailing

shoe

type
drum
brakes
for

the
rear

wheels

All
brakes
are

hydraulically
operated
from
the
brake

pedal

with
the
rear
brakes

additionally
operated

by
a
mechanical

handbrake
and

linkage
system
Either
a

single
or
a
tandem

master

cylinder
can
be
fitted
The
tandem
master

cylinder

provides
a
dual

braking
circuit
in
which
the
front
and
rear

brakes
are

separately
supplied
If
ODe
circuit
fails
the
other

circuit
will

still

operate
and
provide
a
reduced
but
efficient

braking
action

The
brake

pipes
are

double
wall
steel
tubes
and
are

galvanized
at
the
sections
beneath
the
vehicle
floor
to

prevent

corrosion

MASTER

CYLINDER
Removal

Either
a

tandem
or

single
master

cylinder
can

be
fitted

to

the
vehicle

Fig
L
I
shows
a
cross
sectional
view

through
the

tandem
master

cylinder
and

Fig
L
2
a
cross

sectional
view

through
the

single
master

cylinder
The
removal
and

dismantling

procedures
are

similar
for
both

types
and
are

carried
out
in

the

following
manner

1
Remove
the
clevis

pin
and

separate
the
brake

pedal
from

the
master

cylinder
push
rod

2
Disconnect
the

brake
tubes
from

the
master

cylinder

3
Remove

the
master

cylinder
mounting
bolts
withdraw

the
shims
and
take
out
the
master

cylinder
assembly

MASfER
CYLINDER

Dismantling
and
Overhaul

Drain
the
brake
fluid
from
the

cylinder
and
remove
the

stopper
bolt
Remove
the

dust
cover

the

snap
ring
the

stopper

ring
and
the

pusbrod
assembly

Take

out
the
primary

piston
and

secondary
piston

assemblies
and
the

piston
spring

Remove
the
valve

cap
and
take
out
the
valve

assembly

Oean
all
the

components
with
brake

fluid
and
check

them

for
wear
or

damage
Make
sure
that
the

cylinder
bore
and

piston
are
not

damaged
or

unevenly
worn

The
clearance

between

cylinder
and

piston
must
not
exceed
0
15mm
0
006

in
REAR
DRUM
BRAKE

Adjusting

FRONT
DISC
BRAKE
Friction

pads

FRONT
DISC
BRAKE
Removal
and

Dismantling

FRONT
DISC
BRAKE

Assembly
and
Installation

HANDBRAKE
Removal
and
Installation

BLEEDING
THE
HYDRAULIC
SYSTEM

BRAKE
PEDAL
ADJUSTMENT

Check
the
return

springs
for

damage
or
loss

of
tension

Replace
any
part
which

is
in
an

unsatisfactory
condition

MASfER
CYLINDER

Assembly
and
Installation

Assembly
of
the
master

cylinder
is
a
reversal
of
the

dismantling
procedure
noting
the

following
points

Wet
the

cylinder
bore
and

piston
etc

with
brake
fluid

before

assembling
Care
must
be
taken
to

prevent
dust
and

foreign
matter

entering
the

cylinder
and
reservoir
Ensure
that

cups
and
soals
are
not

damaged
when

locating
them

After
the
master

cylinder
is
reinstalled
the

system
must

be
bled
and
the

pedal
height
adjusted
as
described
under
the

appropriate
headings

BRAKE
LINES

Replacing

The

layout
of
the
metal
brake

pipes
and
flexible

hoses
is

shown
in

Fig
L
3

The
brake

pipes
can

be
removed

by
taking
off
the
flare

nuts
at
both
ends
of
the

pipe
and

removing
the

clips
securing

the

pipe
to

the

body
Similarly
the
brake
hoses
can
be
removed

by
taking
off
the
flare
nuts

Thoroughly
clean
the

pipe
or
hose
after

removing
from

the
vehicle
and
check
for

collapsing
cracking
or

rusting
of

the

pipe
and
for

signs
of

expansion
and

weakening
of
the
hose

Any
pipe
or
hose
which
is
not
in
a

satisfactory
condition
must

be
renewed
Remove

any
dust
from
the
brake

clip
and
replace

the

clip
if
the

vinyl
coating
is
torn

Installation
is
a
reversal
of
the
removal

procedure
Make

sure
that
the
brake

pipes
cannot
vibrate

against
any
part
of

the
vehicle
and
the
brake
hoses
are
not
twisted
and

rubbing

against
the

tyres
or

suspension
units
If
the
brake
hose
is

disconnected
from

the
three
way
connector
on

the
rear
axle

housing
it
will
be

necessary
to
fit
a
new

copper
sealing
washer

Do
not

overtighten
the
installation
flare
nuts

the
correct

tightening
torques
are
as
follows

Three

way
connector
master

cylinder
and
brake
hoses

1
5
1
8

kgm
II
13Ib
ft

Fill
the
master

cylinder
with
recommended
fluid
and
bleed

the

system
as
described
under
the

appropriate
heading
Make

sure
that
fluid
is
not

leaking
from

any

part
of
the

system
by

fully
depressing
the
brake

pedal
for
several
seconds
Check
the

pipes
and
connections
and

replace

any
defective

part

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