1969 DATSUN 510 air conditioning

BrakIng
System

Description

Front

disc
brake
Friction

pads

Front

disc
brake
Removal
and
Installation

Rear
drum

brake
Removal
and
Installation

Master
Vac
Servo
Unit

Handbrake

cables
Removing

Handbrake

Adjusting

Brake

pedal

Adjusting

Rear
drum

brake

Adjusting

Bleeding
the

hydraulic
system

DESCRIPTION

The
vehicle
is
fitted
with
disc
brakes
for
the
front
wheels

and
leading
trailing
shoe

type
drum
brakes

for
the
rear
wheels

A
conventional

single
master

cylinder
is
fitted
to

the

Standard
and
DeLuxe
models
See

Fig
D
I
for
details
The

DeLuxe
models
are
however
additio

ally
equipped
with
a

Master
Vae
servo

unit
which

provides
a

much
higher
braking

performance
with
minimum
force

required
on
the
brake

pedal

A
tandem
master

cylinder
and
Master
Vac
servo
unit
are

fitted
as
standard

equipment
to
the
Datsun
CL30UA
and
CL3

OUT
models
Fig
D
2

gives
an

exploded
view
of
this

type
of

master

cylinder

The
handbrake
is
of
the
mechanical
type
with
the
handle

linked
to
the
rear
shoe

operating

lever
through
a
system
of

rods
and
wires
See

Fig
D
3

As
on

previous
models
a

brake

pressure
differential
warn

ing
light
switch
is

incorporated
with
dual
brake
circuits
The

front
and
rear
brake

systems
are
connected
to
the
switch
which

provides
a

warning
via
a

warning
light
on
the
instnllnent
panel

when
a

pressure
difference
of
13
to
17

kg
sq
cm
IB5
to
242

lb
sq
in
occurs
between
the
front
and
rear

systems

Brake

piping
layouts
of
the
single
and
tandem
master

cylinder
systems
are
shown
in

Figs
D
4
and
0
5

FRONT
DISC
BRAKE
Friction

pads

The
disc
brakes
are
self

adjusting
but
the
friction

pads

should
be
checked
for
wear
after
the
fIrst
6
000
un
4
000
miles

and
then

every
5
000
km
3
000
miles
The

pads
must
be

replaced
if
the
friction

lining
on

any
pad
has
worn
to
less
than

1
0
mm
0
04
in

The
thickness
of
the

pads
can

easily
be
checked
after
remov

ing
the
anti
rattle

clip
from
the
calliper
plate

Full

servicing
procedures
are

given
in
the
section
BRAKING

SYSTEM
for
vehicles
fitted
with
Ll4
Ll6
and
Ll8

engines

FRONT
DISC
BRAKE
Removal
and
Installation

Refer
to

the
section
BRAKING
SYSTEM
for
the
Ll4
L16

and
LIB

engines
for
full
details
of
the
removal

and
installation

procedures

Check
the
thickness
of
the
friction

pads
as

previously

described

and

replace
them
if

necessary
Check

the
brake
disc
for

scoring
and
out
of

round
The

standard
diSc
thickness
is
10
0
mm
0
394

in
and
must
not

be

reground
below
8
40
mm
0
331
in
The
run
out

of
the

disc
should
be
less
than
0
06
mm

0
0024
in
and
can
be

checked

with
a
dial

gauge
positioned
near

the
outer

diameter

of
the
disc
as

previously
described

REAR
DRUM
BRAKE
Removal
and
Installation

The
rear
drum
brakes
See

Fig
D
6
can
be
removed
and

inspected
as
described
in
the

section
BRAKING
SYSTEM
for

vehicles
fItted

with
L14
L16
LIB

engines

Examine
the
brake
drums
for

scoring
and
out
of

round

The

maximum
inner
diameter
of
the

drum
must
not

exceed

229
6
mm
9
040

in
after

reconditioning
Out
of
round
should

be
below
0
05
mm
0
002
in

Renew

the
brake
shoe

linings
if

they
are
contaminated
or

incorrectly
seated
or
if
the

thickness
of
the

lining
has
been

reduced
to

1
5
mm

0
06
in
or
less
Oil
or

grease
can
be
re

moved
from
the

linings
by
cleaning

thoroughly
with
carbon

tetrachloride
or

petrol

Check
the
shoe

return

springs
and

replace
them
if

they

have
become
weakened
Check
the

bores
of
the
wheel

cylinders

for

signs
of
wear

damage
or
corrosion
Renew
the

cylinders

and

pistons
if
the
clearance

between
the
two

parts
exceeds
to

0

15
mm

0
006
in
Renew
the
c

ps
when

overhauling
the

wheel

cylinders

MASTER
V
AC
SERVO
UNIT

Removing
and

Dismantling

The
servo

unit
should
be
removed
and
overhauled
at

yearly

intervals
A
Master
Vac

repair
kit

is
available
and
all

parts

marked
in

Fig
D
7
should
be
renewed
after

dismantling
the

unit
These
items
are
all

supplied
as

part
of
the
repair
kit

The
unit
can
be

removed
as

follows

Remove
the
clevis

pin
from
the

push
rod
and
detach
the

Master
V
ac

unit
from
the
brake

pedal

2
Disconnect

the
brake
tube
from
the
master

cylinder
and

the
vacuum
hooe
from
the
Master
Vac

3
Take

off
the

retaining
nuts

and
remove
the
Master
Vac
and

spacer
then

separate
the
master

cylinder
from
the
Master

Vac

Mark

the
front

cylinder
shell

and
the
rear
shell

and
stud

assembly
before

dismantling
the
unit
then

proceed
as

follows

S31