1977 DATSUN PICK-UP torque

After

connecting
brake
tube
be

sure
to

check
the
clearance
to

prevent

from

damage
The
clearance
at

the

following
portions
must
be

specified

distance
or

more

Tube
to

body
panel
and

frame

Over
5

mm
0
20
in

Tube

to
edge
of
each

panel

Over
10
mm
0
39

in

Tube
to
tube

Loop
pitch

OVer
5
mm
0
20
in

Between
front
tube
and

rear
tube

Over
9

mOl
0
35

in

Tube
to

moving
parts

Over
10
mm
0
39
in

Loop
tube
to

hood

ledge

panel

Over
10

mm
0
39
in

Notes

a
Brake
tubes
are

shaped
at

factory

to
secure

specified
clearance
and

may
not

require
reshaping
Discard

if

they
call
for
excessive

reshaping

b
In

reshaping
a
brake
tube
take
care

to
avoid

damaging
galvanization
or

collapsing
section

Mter
brake
lines
have
been

asssem

bled
check
to
make
sure
that
all

fittings
and
flare
nu
Is
ale

lightened
to

correct

torques

Tightenint
torque

Brake
tube
to
connector

I
Ston

kg
m

II
to

13
ft
Ib

Brake
tube
to
brake
hose

1
7
to

2
0

kg
m

12
to
14
ft
lb

Connector
and

clip
fixing
bolt

O
3S
to
O
4S

kg
m

2
5

to
3
3

ft
lb

3

way
connector

fixing
bolt

on
rear

axle
case

0
8
to
1
1

kg
m

6
to
8
ft
lb

N
L
S
V

DESCRIPTION

The

Nissan
Load

Sensing
Valve

N
L
S
V

serves
to

change
braking

power
of
the

rear
wheels
in

response

to

changes
in
the
load
and
fluid

pressure
improving
braking
stability

and

shortening

stopping
distances
Brake

System

The
N
L
S
V

is
installed
on
the

frame

being
inclined
at
10

degrees
A
summary
of

the
N

L
S
v

operation
is

given
in

Figures
BR
14

and
BR
15

r
Master

cylinder
TI
II

I

y

1

J

I

l
Attaching
angle

D

Wheel

cylinder

BR928

Fig
BR
14
Construction

of
N
L
S
V

Performance
curve
of
brake
fluid

pressure
is
as

follows

0

S

c
A

0

C

o

l
0
oadea

U1U

Front
wheel

cylinder

fluid

pressure
BR769

Perfonnance
curve

of
fluid

pressure
Fig
BR
15

N
L
S
V
TEST

the

following
occurs

When
rear
wheels
lock

stopping

distance
is
shorter
than
13
1

m
43

0

ft
whether
loaded
or
unloaded

Stopping
distance
should
be

measured

from
the

place
where
the
brake

pedal

is

first

applied
to
the

place
the
vehicle

actually

stops
Front
wheels
lock

simultaneously
with
or
ahead
of
rear

wheels
Operating
test

The

test
should
be
conducted
under

these
conditions

Drive
a
vehicle
with

pay
load
and

then
with

only
driver
on

a

dry
flat

concrete
or

asphalt
road

applying
the

brake
suddenly
at
40
km

h
25
MPH

N
L
S
V
is

functioning
normally
if

BR
9

2
The
allowable
maximum

out
of

round
of
brake
drum
is
0
02

mm

0

0008
in

Re

condition
or

replace
brake
drum

if

specified
limit
is
exceeded

3

Measure
for

tapered
brake
drum

If

specified
limit
of
0

02
mm
0

0008

in
is

exceeded
as
measured
at

a

position
where
the
distance
of
4S
mm

177
in
is

kept
away
from
inlet

re
condition
or

replace
brake
drum

4

Contact
surface
with
which

linings
come
into

contact
should
be

finished
to

such
an
extent
that
it
is

ground
by
a
No
120
to
150
sand

paper

S

Using
a
drum

racer
finish
brake

drum

by
machining
if
it

shows

any

sign
of
score
marks

partial
wear
or

stepped
wear
on
its
contact
surface

Note
After
brake
drum
is

completely

re
conditioned
or
renewed
check

drum
and
shoes
for

proper
contact

pattern

Brake

assembly

I
When
brake
shoe

linings
are

cracked

incompletely
seated
uneven

Iy
worn

andlor
deteriorated
due
to

excessive

heating
or
soiled
with

oil

grease
and
brake
fluid

replace

2

Replace
linings
if
the
thickness
is

worn
down
to
less
than
1
0
mm
0
039

in

Note

When
brake
shoe

lining
is
in

stalled

grind
brake
shoe

lining
face

to
diameter

equal
to
that
of
brake

drum

lining
dimension

Width
x
Thickness
x

Length

4S
x

4
S
x

244
mm

1
77
x
0

177
x

9
61
in

3

Check

adjuster
for
smooth

oper

ation

4

Replace
shoe
return

springs
which

are
broken
or

fatigued
Brake

System

Standard
dimensions
of
shoe

springs

Free

length
Dia

of

spring
No
of
Installed

Item

lengthlload

mOl

in
mOl
in

coils

mm

kg
in
lb

Upper
136
5

2
0
0

079
37
IS9
S
14

to
16

S

37
6
28
31

to
3S

Lower
134
S

2
3
0
091
35
IS9
5
21

to
23

5
30
6
28
46
to

Sl

After
shoe
83
2

1
4
O
OSS
27
S
99
4

to
S

3
28
3

90
9
to
II

Wheel

cylinder

I

Replace

any
cylinder
or

piston

which
is
scratched
scored
or
worn
on

its

sliding
contact
surface

2

Replace
worn

parts
if

piston
to

cylinder
clearance
is

beyond
O
IS
mm

0
OOS9
in

Wheel

cylinder
inner
diameter

19
0S
mOl

Y
in

3

Replace
piston
cup
which
is

worn

or
otherwise

damaged

4

Replace
if

contacting
face
of

cyl

inder
and
shoe
is
worn

locally
or
in

step

S

Replace

damaged
dust
cover

fatigued
piston
spring
or

faulty

threaded

parts

6

Replace
tube
connector
which
is

worn
on
its

threaded

portion

INSTALLATION

Install
front
brake
in
the

reverse

sequence
of
removal

paying
particular

attention
to
the

following
instructions

I

When

assembling
adjuster
assem

bly

apply
brake

grease
to

adjuster

housing
bore

adjuster
wheel
and
ad

juster
screw

When
installing
adjuster

assembly

to
brake
disc

apply
brake

grease
to

disc

adjuster
and

retaining
spring
slid

ing
surfaces

to
slide

adjuster
smoothly

Measure

adjuster
sliding
resistance

Adjust
by
adjuster
shim
when

sliding

resistance
is

in
rrect

BR
ll
Adjuster
sliding
resistance

S
to

12

kg
II
to
261b

2

When

installing
wheel

cylinder
be

sure
to
secure
the

cylinder
with
R

mark

to
right
hand
disc
and
the
one

with
L
mark
to

left
hand
disc

Otherwise
brake
hoses

may
interfere

with
other

adjacent
parts
As

to
the

connecting
instructions

of
brake
hose

no
twist
or

contact
is
existed
on

brake

hose

referring
the

related

topic
Brake

line

Tightening

torque

Wheel

cylinder

SA
to

6
6

kg
m

39
to
48
ft

lb

Connector
bolt

1
9
to
2
5

kg
m

14
to
18
ft
Ib

Brake
hose

1
7
to
2

0

kg
m

12
to
14
ft
lb

Air
bleeder

0
7

to
0
9

kg
m

5
to
7
ft

Ib

Brake
disc

4
2

to
S
O

kg
m

30

to
36
ft
lb

3

Before
installing
brake
shoe
as

semblies

apply
brake

grease
to
wheel

cylinder
and

adjuster
brake
shoe
in

stalling
grooves
and
brake
disc
and

brake
shoe

assembly
contact
faces

two

places
Exercise

care
not
to

allow

grease
to

come
into
contact
with

linings
and

adjuster

f

BR317

Fig
BR
23

Gre
ing
point

4

Tightening

torque

Wheel

cylinder

J
S
to
1

8

kg
m

II
to

13ft
Ib

Connector
bolt

1

9
to
2
5

kg
m

14
to
18
ft
Ib

Brake
tube

1
5
to
1

8

kg
m

II

to
13

ft
Ib

Air
bleeder

0
7
to
0
9

kg
m

S

to
7
ft
Ib

Brake
disc

5
4

to
6
4

kg
m

39
to
46
ft

Ib

S

Adjust
brake
shoe
clearance
and

bleed
brake

system
Upon
completion

of

the
above

adjustments
make
sure

that
brake

operates
correctly
and
no

brake
fluid
leaks

MASTER
VAC

DESCRIPTION

A
vacuum

suspended
Master
Vac

is

installed
behind
the

master

cylinder

As
the

brake

pedal
is

depressed
fluid

is

forced
under

high
pressure
through

the
brake

pipes
to
the
wheel

cylinders

to
retard

or

stop
the

vehicle

The
Master
Vac
contains

a

spring

loaded

diaphragm
of
IS2
4

mm
6
in

in

diameter
It

operates
on

negative

pressure

produced
n
the

engine
intake

manifold

The
tandem

master

cylinder
is

capable
of

producing
high
pressure

even
if
the
Master
Vac
is

faulty
Brake

System

Note
The
Master
Vac

diaphragm
dif

fers
from
fonner
ones
for

improved

braking
force
Do
not
install
fonner

Master
Vac
on
1976
models
The

1

Plate
and
seal

2
Push
rod

3

Diaphragm

4

Rear
shell

5

Diaphragm

plate
Master
Vacs

are
identified

by
the

label
color
as
follows

1976
model
Caution

Label

Former
models
YeJlow

BR321

11

Valve

operating
rod

12
Valve

return

spring

13

Poppet
return

spring

14
Exhaust
valve

15
Valve

plunger

16
Reaction

disc

17

Diaphragm
return

spring

18
Front
shell
6
Seal

7

Vacuum
valve

8

Poppet
assembly

9
Valve

body
guard

10
Air

silencer
filter

INSPECTION
OF

OPERATION

Checking
yscuum

pressure

I
Connect

a
vacuum

gauge
in
the

line
between
check
valve

and
Master

2
Start

engine
and
increase

engine

speed
Stop
engine
when
vacuum

gauge
indicates
SOO

mmHg
19
69

inHg

BR
14
Fig
BR
24
Sectionall1iew

of
Master
Vac

Vac
as

shown
in

Figure
BR
25

1

Check
valve

2

Vacuum

gauge

BA169

Fig
BR

25
Air

tight
t
t
t

up

Air

tight
test

I
Fifteen

seconds
after

engine
is

stopped
observe
the

rate
of

drop
in
air

pressure
registered
by
vacuum

gauge

If
a

pressure
drop
of
25

mmHg
0
98

inHg
is

exceeded
refer
to
the
follow

ing
chart
to
determine
the
cause
of

failure

3

Align
marks
scribed
in
the

rear

shell

and
front
shell

Carefully
turn
the

Master
Vac
Wrench
ST08080000

clockwise
until
it
reaches
notch
in

shell

retainer

Fig
BR
43

Tightenilll
reor
shell

4

After

assembly

adjust
the

length

of

push
rod
to
less
than
the

specified

value
indicated
below

Length
adjust

ment
of

push
rod
is

made
at
the

tip
of

push
rod

HAND
BRAKE
Stick
lever

typ
e

REMOVAL

HAND
BRAKE

Stick

lever

type

The
hand
brake

system
is
of
a
cable

reaction

type
which
actuates
rear
Brake

System

Length
B

10
0

to
10
5
mID

0
394

to
0
413
in

rl

J

BA290

Fig
BR
44

Lelll
th
at

B

Fig
BR
45

Adjusting
push
rod

length

HAND
BRAKE

CONTENTS

BR
18

BR
19
INSPECTION

INSTALLATION

wheel
brake

shoes
All

the
cable
ad

justment
can
be
made

by
operating

BR
18
INSTALLATION

Install
in
the

reverse

sequence
of

removal

Tightening
torque

Master

cylinder
to

Master
Vac

0
8

to
I

1

kg
m

6
to
8
ft
lb

Master

Vac
to

body

0
8

to
1
1

kg
m

6
to

8
ft
Ib

Note

After
Master
Vac
is

properly

installed
on
vehicle
be
sure
to

conduct
an
air

tight
test
and

oper

ation
test

described

previously
in

this
section

BR
19

BR
19

only

adjusting
nut
at
balance
lever

Brake

System

Tightening

torque

Master

cylinder
to
Master
Vac

kg
m
ft
Ib

0
8
to
l
l
6

to
8

Brake
tube

flare
nut

kg
m

ft
Ib
I
S

to
1
8

II
to
13

Brake

hose
connector

kg
m

ft
lb
1
8
to
2
1
13
to
IS

Air

bleeder
valve

kg
m
ft
lb

0
7
to
0

9
S
to
7

Fulcrum

pin
of
brake

pedal
kg
m

ft
Ib
1
2
to

1
5
9
to
II

Connector
and

clip

fIXing
bolt

kg
m
ft
lb

0
35
to
O
4S

2
5
to
3
3

3

way
connector

fIXing
bolt

kg
m
ft

Ib

0
8
to
l
l

6
to
8

on
rear
axle

case

Brake

pedal
stopper
lock
nut

kg
m
ft
Ib
1
2

to
1
5

9
to
II

N
L
S
V

to

body

kg
m
ft
Ib
0
8
to
l
l

6
to
8

Wheel

cylinder

mounting
nut

Front

kg
m
ft

Ib
S
4

to
6
6
39

to
48

Rear

kg
m
ft
Ib

1
5
to
1

8
II

to
13

Wheel

cylinder
connector
bolt

kg
m
ft
lb
1
9

to
2
5

14
to
18

Brake
disc
Back

plate
nut

Front

kg
m
ft

Ib
4
2
to
S

O
30
to
36

Rear

kg
m
ft

Ib
S
4

to
6
4
39
to
46

Master
Vac

Master

Vac
to

body
nut

kg
m
ft
lb
0

8
to
l
l
6
to
8

Flange
to

shell
cover
nut

kg
m
ft
lb

0
8
to
1
1
6
to

8

Operating
rod
lock
nut

kg
m

ft
Ib
1
6
to
2
2
12
to

16

Push
rod

adjusting
nut

kg
m

ft
Ib
1

9
to
2
4
14
to
17

BR
21

Condition

Brake
chatters

Brake

squeals

Pedal

pulsates

Brakes
fade

Brakes

drag

Unbalanced
brakes
Brake

System

Probable
cause

Groove

or
out
of

round
brake
drum

Loose

or
bent

brake

disc

Distorted
brake
shoes

or

pads

Grease
or
brake
fluid
on

linings

Dirty
or
scored
brake

drums

Distorted
brake
shoes
or
bent

support
plate

Weak
or
broken
brake
shoe

retaining
spring

or

return

spring

Glazed
or
contaminated
brake

lining

Out
of

round
or
off
center
drum

Brake
fluid
has
too
low

boiling
point

Use
of

improper
linings
or
brake

linings
are

contaminated

Brake
drums
are
out
of
round

Hydraulic
connections
master

cylinder
and

wheel

cylinders
are

corroded
or

damaged

Bleed
screw
is

open

Pedal

linkage
is

binding
or

push
rod

adjust

ment
is
too

long

Master

cylinder
compensator
part
is
ob

structed

Seized
master

cylinder
piston

Poor
shoe
condition

Poor

wheel
cylinder
condition

Deformation
of

piston
cups

Hand
brake
will
not
return

Clogged
master

cylinder
return

port

Improper
tire
inflation

Improper
adjustment
of
shoe

to
drum
clear

anee

Grease
oil
mud
or
water
on

linings
or

pads

Mud
in

brake
drum

Deterioration
of

linings
or

pads

Excessive
wear
of

linings
or

pads

BR
23
Corrective
action

Grind
or

replace
as

required

Tighten

support
plate
bolts
to

specified

torque
or

replace
plate

Replace
as

necessary

Replace
linings

Blowout

assembly
with

compressed
air
or

refinish
drum

Replace
faulty
unit

Replace
if

faulty

Cam

ground
lining
to
eliminate

glaze
If

it

doesn
t

replace
linings

Turn

drum
or

replace
as
necessary

Drain
and
fill

system
with

approved
fluid

Replace
linings

Repair
or

replace
as
necessary

Repair
as
necessary

Close
screw
and
bleed

system

Lubricate

linkage
check

pedal
return

spring

for
condition
and

adjust
push
rod

as
neces

sary

Blowout

foreign
matter
with

compressed

air

Disassemble
master

cylinder
and

replace

piston
Bleed

system

Clean
and

repair

Repair
or

replace

Replace

Check
and

repair

Clean

Inflate
to
correct

pressure

Readjust

Clean
brake

mechanism
and
check
for
cause

of

problem
Replace
linings
or

pads

Clean

Replace

Replace

No
Tool
number

tool

name

1
GG943
10000

Flare

nut

torque
wrench

2
ST08080000

Master
V
ac

wrench

3
ST08060000

Master
Vac

oil
seal

retainer
drift
Brake

System

SPECIAL
SERVICE
TOOLS

Description

Unit

mOl
in

This
tool
is
used
to

tighten
and

untighten
brake
tube
flared
nut

A

built
in

torque
limiting
wrench
is

provided
to
assure

torque

accuracy

SE227

This
tool
is
used
to

remove
rear
shell
after

aligning
rear
shell
stud

bolt

with
the

opening
in

this
tool

SE073

This
tool
is
used

when
rear
shell
seal
is
driven
into

position

Note

Make
sure

that
this
tool
is

pushed
in
until

rear

guide
of
this

tool
touches
rear
shell

SEll5

BR
25
For

use

on
Reference

page
or

Figure
No

All

Page
BR
8

models

All

Fig
BR
3l

models

All

Fig
BR

39

models

Condition

Wheel
wobbles

Unevenly
or

excessively
worn

tire

Tire

squeals
Wheel
and
Tire

TROUBLE
DIAGNOSES
AND
CORRECTIONS

Probable

cause

Improper
tire

pressure

Damaged
tire

or
distorted
wheel

rim

Unbalanced
wheel

Loose
wheel
nuts

Worn
or

damaged
wheel

bearing
or
excessive

play
of
wheel

bearing

Improper
front
wheel

alignment

Worn

or
damaged
ball

joint

Excessive

steering
linkage

play
or
worn

steering

linkage

Loose

steering
linkage
connection

Broken

suspension
spring

Damaged
shock

absorber

Improper
tire

rotation

Improper
tire

pressure

Unbalanced
wheel

Improperly
adjusted
brake

Improper
wheel

alignment

Excessively
distorted
or

improperly
installed

suspension
link

High
speed
on

curves

Sudden
start

and

improper
speed
due
to

rapid
acceleration

or

improper
brake

ap

plication

Improper
tire

pressure

Improper
front
wheel

alignment

Distorted
knuckle
or

suspension
link

WT
5
Corrective
action

Measure
and

adjust

Repair
or

replace

Balance

Tighten

Correct

play
or

replace
wheel

bearing

Align

Replace

Adjust
Or

replace

Tighten
nuts
to
rated

torque
or

replace

worn

parts
if

any

Replace

Replace

Conduct
tire

rotation

periodically

Measure
and

adjust

Balance

or

replace

Adjust

Align

Repair

replace
or
if

necessary
reinstall

Reduce

speed

Follow
correct
and

proper
driving
manner

Measure
and

adjust

Align

Repair
or

replace