1973 DATSUN B110 Service Repair Manual

Removal
and

disassembly

The

single
master

cylinder
is
removed

and
disassembled

in
the
same

manner
as
the
tandem

type
master

cylinder

Inspection

Refer
to
the
section

covering
Inspection
of
tandem

type
master

cylinder

Reassembly
and
reinstallation

The

single
master

cylinder
is
reassembled
and

re
BRAKE

installed
in
the
same

manner
as
the

tandem

type
master

cylinder

BRAKE
LINE

The
bl1lke

pipe
adopts
a

double
wall
construction

steel

tubing
and
with
this
construction
lhe

rigidily
has
been

improved
Moreover
the

portion
of
brake
line
laid

beneath
the
vehicle

floor
is

galvanized
improving
the

corrosion
resistance

1

Bridge
tube
9
Brake
hose

2

Brake
tube
10

Bridge
tube

3
Brake
hose
11
Brake
tube

4
Brake
tube
12
Brake
hose

5
Brake
tube
13

Brake
tube

10
6
3

way
connector
14

3

way
connector

7
Brake
tube

15
Brake
tu
be

8
Brake
hose

Fig
BR
6
Brake

line

Removal

1
Remove

flare
nuts

from
both

ends
of
the
brake
tube

steel

tube
and
remove

clips
used
to
secure
the
brake

tube

on
the

paneL
The

brake
tube

can
be
removed

easily

I
1

I
Brake

master

cylinder

I
2

Front
3

way
connector

Fig
BR
7
Brake
tubes
around
master

cylinder

BR
5

CHASSIS

1

I
Front
3

way
connector

I
2

I
Brake

master

cylinder

I

Fig
BR
8
Front
3

way
connector

2
The
brake

hose
rubber
hose
is

used

at
the
front

strut

assembly
unit
and

fear
axle

housing
unit
Remove

the

flare
nut
from
the

brake
tube
and

remove
the
hose

I
r

I

I

l
j

u
l

I

J

II

V

r
1

0

l
I

l

I

I
Brake
hose

I
3

I
Rear
axle

hOUSing

2
Rear
3

way
connector

Fig
BR

9
Brake
hose
and
3

way
connector
around

rear
ax
Ie
housi

g

1
1
Brake
hose

I
2

I
Strut

assembly

Fig
BR
J
0
Brake
hose

around

front
strut

assembly
Inspection

L

Thoroughly
clean
the
brake
tube

and
brake
hose
and

check
them
for

collapsing
crack
scar
and
rust
brake

tube
and
for
weakness

expansion
wear
etc
brake

hose

Replace
if
defective

2
Remove

mud
and
dust

from
the

brake
tube

clip
unit

and
check
the

clip
If
the

clip
covering
vinyl
coating
is

torn

repair

Reinstallation

1
Provide

a
sufficient

space
between
the
brake
lines

and
other

parts
so
that
the
brake
lines

are
not
interfered

with
other

parts
due
to
vibration

during
driving

SHORT
NAIL

DOUBLECLI
S

t

LONG
NAI
L

BRAKE
TUBE

PANEL

CLIP

COATED

WITH

VINYL
BRAKE

TUBE

Fig
BR
l1
Brake

tube
installation

clip

2
When
the
brake
hose

is
disconnected
from
the
3

way

connector
on
the
rear
axle

housing
once
be
sure
to

replace
the

copper
packing
with
a
new
one

3
Be
careful
not
to

warp
or

twist
the
brake
hose
and

particularly
be
careful
not
to

interfere
the
brake
hose
with

tires

and

suspension
components

4

Do
not

tighten
the
brake
line
installation
flare
nut

forcedly
or

excessively

BR
6

Tightening
torque

3

way
connector
1
5

to
1
8

kg
m

10
8
to
13
0
ft
lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lh

1
5
to
1
8

kg
m

10

8
to
13

0
ft

lb

0

7
to
0
9

kg
m

5
1
to
6
5

ft
1b
Master

cylinder

Brake
hose

Air
bleeder

5

Fill
the

master

cylinder
brake

fluid
reservoir
with

brake
fluid
and

perform
air

bleeding
complele1y

Note
a
Do
not
use

brake
fluid
other
than

specified

b
The

specified
brake
fluid
is
used
for

both

single

and
tandem

type
master

cylinders

6

Upon

completion
of
air

bleeding
make

sure
that
the

brake

operates
correctly
and
check
the
brake
tube
and

hose
connectors
for
fluid

leaking
Fully
depress
the

brake

pedal
continue
to

depress
the
brake

pedal
for
several

seconds
and
make
sure
that
no
brake

fluid
leaks
from

any

part
of
the
brake
line

Replace
defective

part
if

required

Brake
line

pressure
differential

warning

light
switch

A

warning
light
is

located
on
the
instrument

panel
to

warn
the
driver
when

a

pressure
difference
of
13

to
17

kg
cm2
185
to

2421bJsq
in
exists
between
the

front
and

rear
b
rake

systems

A

hydraulically
actuated

warning
light
switch

is
located

in

the

engine
compartment
Both
front
and
rear
brake

systems
are
connected
to
this
switch
assembly

When

a

pressure
difference
of
13

to
17

kgJcm2
185
to

242

lbJsq
in
occurs
between
the
front
and
rear

brake

systems
the
valves

will
shuttle
toward
the
side
with
the

low

pressure
The
valve
contacts
with
the
switch
terminal
BRAKE

the

ground
circuit

for
the

warning
light
is

completed
and

thus
the

warning
light
lights

In
this

case
correct
the

hydraulic
brake

problem
and

bleed
the
brakes

Check
the

warning
light
switch

assembly
for
a

proper

operation
Check
the
switch

assembly
for
fluid

leakage

Note
Do

not

attempt
to

repair
switch
for

any
reason

replace
switch

assembly
completely

1
To
front
brake

L
H

2

From
master

cylinder
F

3
From
master

cylinder
R
4
To
rear
brake
L
B
R
M

5
To
front
brake
R
H

Fig
BR
12

Warning
light
switch

r

I

@

I
I
3

I
Valve

assembly

4

Piston
load

spring
Wire
terminal

Brake
tube

Fig
BR
13
Sectional

view

of

warning
light
switch

BR
7

CHASSIS

FRONT
DRUM
BRAKE

14
I

l

Fig
BR
14
Front
drum
brake

components

Removal
and

disassembly

Jack

up
the
vehicle

support
with
a
stand

and

remove
the
wheel
cover
and
tire

2
Remove

the
brake
drum
and
remove
the
hub

cap

and
hub

assembly
from
the

spindle

3
Disconnect
the

brake
tube

at
the
bracket
unit

of
the

strut

assembly
For
the

details
refer
to
Section
FA

R

W
i

1
t

V
t

1
1

d
j

2
rl

s
J
J
i

Z
j

Fig
BR
15
Front

drum
brake
4
Unhook

the
return

spring
and
remove
the

brake
shoe

assembly

5

Disconnect
the

bridge
tube
from

lhe
fore
and
after

wheel

cylinders

I
I
After
wheel

cylinder

Bridge
tube

I
3

I
Fore
wheel

cylinder

Fig
BR
16

Fore
and

after
wheel

cylinders

and

bridge
tube

6
Remove
the
installation
bolts
and
remove
the
fore

and
after
wheel

cylinders

BR
B

7

Remove
the

brake
disc

installation
bolt
and
remove

the
brake
disc
from
the

spindle

8
Disassemble

the
wheel

cylinders

Inspection

l
Drums

If

they
show

score
excessive
out
of

round

and
so
forth

reconditioning
by
machining
is

required

Brake
drum
inner

diameter

203
2

mm
8
00

in

Drum

inside
out
of
roundness

Below
0

02
mm
0
0008
in

Max

allowable
drum

inner
diameter

204
5

mm
8
051
in

2

Linings
If
brake
shoe

linings
are

incomp1etedly

seated

soiled
or

greasy
or
deteriorated
due

to
excessive

heating
repair
or

replace
them

If
the

thickness
of
the

lining
is
less

than
1
5

mm
0
0591
in

replace
it

Note
a
If
oil
or

grease
is
found
on

linings
clean

thoroughly
with
carbon
tetrachloride
or

gasoline

b
After

installing
and

bonding
lining
grind
the

lining
face

to
a
diameter

equal
to
the
brake
drum

3

Check
the

adjusting
cams

for
their
smooth

operation

4
Return

springs
If

they
are

considerably
weak

replace
them

Return

spring
dimension

Wire
diameter

x
free

length
turns

3
2

x
118

mm
20
5

0
1260
x
4

65
in

20
5

Load
x

length

55

kg
I21
lb
x
127
1

mm
5

00
in

13
4
0
528

ilL
rnv

0
t
6

hl
03

118

4
65

FREE

LENGTH

UNIT
mm

in

Fig
BR
J
7
Return

spring
BRAKE

5

Check
the
brake
disc

for
distortion

6
Check

the
bore
of
the

wheel

cylinder
for
wear

sign

of
rust
and

damage

If
clearance
between

the

cylinder
and
the

piston

exceeds
0
15

mm
0
0059

in

replace
them

Fig
BR
J
8

Sectional
view

of
front
wheel

cylinder

7
When
the

wheel

cylinder
is

overhauled
it
is

recom

mended
that

cups
be

replaced
even
if

apparently
they
are

in

satisfactory
conditions

Cups
must
be

replaced
if

deformed
due
to

damage
crack
corrosion

smelling

andf
or

aging

Reassembly
and
reinstallation

The
rear

brake
is

reassembled
and
reinstalled
in
reverse

sequence
of

disassembly
and
removal
However
note
the

following
matters

When

assembling
the
wheel

cylinder
be

sure
to

apply

rubber

grease
to
the

piston

cup
and

other
rubber

parts

slightly

2
When

installing
the
wheel

cylinder
to
the
brake

disc

apply
brake

grease
to
the

cylinder
disc
and

adjusting

plate
sliding
surfaces
and
to
the
wheel

cylinder
lever

fulcrum

portion

sufficiently
so
that
the
wheel

cylinder

slides

smoothly

BR
9

CHASSIS

Fig
BR
19

Greasing
points
on
brake
disc

3

Tighten
the
brake
disc
installation
bolt

to
2
7
to
3
7

kg
m

19
5
to
26
7
ft
lb
4

Adjust
brake
shoe
clearance
and

perform
air

bleeding
on

the

hydraulic
system

FRONT
DISC
BRAKE

Floating
type
disc

brake
Model
ANNET

12
14A
is

used
for
some
territories
as
a

standard

Rigidity
of
the

caliper
is

high
brake

pedal
feeling
is

adequate
and
the

pad
dragging
is
minimized
The

pad
is

returned

by
elasticity
of
the

piston
seal
When
the

pad
is

worn
the

piston
operating
stroke

increases

slipping

occurs
on
the

piston
seal
surface
and
thus
clearance
is

adjusted
automatically

Moreover
in
order
to

prevent
brake

squealing
a
shim
is

inserted
behind
the

pad

2

I

Clip
6
Brake

pad
II

Cylinder
block

2

Spring
7
Air
bleeder
12
Piston
A

3
Clevis

pin
8

Retaining
ring
13
Bias

spring

4

Shim
9
Boot
14
Yoke

spring

5

Hanger

spring
10
Piston
B
15
Yoke

Fig
BR
20
Front
disc
brake

components

BR
lO

BRAKE

CYLINDER
SIDE

PISTON
SIDE

COMPR
ESSION

DECOMPRESSION

Movement

exceeding
the

elastic

displacement
is

released
with

slipping
on

the
seal
surface
Returns
in
elastic

displacement
of

the

seal

Fig
BR
21
Piston

seal
automatic

adjusting
operation

Brake

pad

Replacement

1
Jack

up
front
unit
of

the
vehicle
and
remove
lhe

front

wheeL

2
Remove

clip
from
the

retaining
pin
and

supporting

the
brake

pad
remove
the

retaining
pin
and
coil

spring

I

I
Brake

pad

2

Retaining
pin

I
31
Clip

Fig
BR
22

Removing
retaining
pin

3
Unhook

the

hanger
spring
and
withdraw
the
brake

pad
and
shim
with
a

pair
of

pliers

BR
ll
Fig
HR
2

Withdrawing
brake

pad
and
shim

Note
When
the
brake

pad
is
removed
do
not

depress
the

brake

pedal
or
otherwise
the

piston
will
come
out

Inspection

Clearance
between
the

brake

pad
and
rotor
is

adjusted

automatically
Check
the
brake

pad
for
wear

after
the

first
10
000
km
6
000

miles

driving
and

every
5
000

km
3
000

miles
thereafter

1

Clean
the
brake

pad
with
carbon
tetrachloride
or

gasoline

2
When
oil
and
or

grease
is

heavily
sticked
on
the

pad

or
when
deteriorated
or
deformed
due
to

overheating

replace
the

pad
with

a
new
one

3
When
thickness
of
the

friction
material

pad
is
less

than
1
6
mm
0
0630
in

replace

Replace
when
total

pad
thickness
is

less
than
6
1
mm

0
2402
in

Note
Replace

pads
as
a
set

Replacement
at

only
one

position

may
cause
uneven
brake
effect
It
is

recommended
that
rotation
of

pads
be
made

periodically

4
Check
the
rotor
Refer
to
Rotor

inspection

Reinstallation

1
Clean
the

calipers
and

piston
pad
installing
parts

Note
Do
not
use
mineral
oil
Be
careful
not
to

apply
oil

on
the
rotor

2

Depress
the

piston
into
the

cylinder
so
that
new

pad

can
be
installed

CHASSIS

Fig
BR
24

Depression
piston
A

and
B
into

cylinder

Nota
a
Nota
that
brake
fluid

may
overflow
from
the

reservoir
It
is
recommeooed
that

operation
be

carried
out

by

loosening
the
breather
to
release

brake
fluid

b
The

piston
can
be

easily
pushed
in

by
hand
But

if

pushed

excessively
the

groove
of

piston
goes

inside
of
seal
as
shown
in

Figure
BR
25
and
the

seal
will
be

damaged
When
the

piston
is

pushed

excessively
into
the

cylinder
remove
the
brake

assembly
disassemble
it

push
out
the

piston
to
the

arrow
direction
as
shown
in

Figure
BR
25
and

reassemble

r
w

i

@

I

I

I

I
i

I

I

I

1

I
1

1
Piston

ieat

1
2

I
Normal

position
I

Fig
BR
25
Piston

pushing
in

position

3

Install

pad
and
anti

squeal
shim
assemble

the

anti

squeal

spring
and

retaining

pin
and

secure
them

with

clip
ARROW

MARK

Fig
BR
26
Arrow
mark
on
shim

I

Install
the
shim

so
that
the
arrow

mark

points
the

rotor
forward

rotating
direction

2

Apply
the
coil

spring
to

the

retaining

pin
which
is

distanced

from
the
air

bleeder

4

When
the

pad
is

installed

depress
the
brake

pedal

several
times

so
as
to
settle
down
the

pad
in
the

position

Caliper

assembly

Removal

L

Remove
the
brake

pad
Refer
to
Pad
re

placement

2

Disconnect
the
brake

tube
from
the
wheel

cylinder

3

Remove

the
strut

assembly
and

knuckie
arm
instal

lation
bolt

so
as
to

ease
removal
of

the

caliper

assembly

installation
bolt

BR
12