Datsun 1800 Braking System Description; Datsun 1800 Front Disc Brake Friction Pads/Removal And Installation; Datsun 1800 Rear Drum Brake Removal And Installation; Datsun 1800 Master-Vac Servo Unit Removing And Dismantling - Datsun 510 series Workshop Manual

BrakIng System
Description
Front disc brake Friction
pads
Front disc brake
Removal and Installation
Rear drum brake Removal and Installation
MasterVac 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
10
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 3 94
in and
must not
be
reground below 8 4 0
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