Datsun 1000 Workshop Manual page 130

DRUM BRAKES
I DES IlIPTIOI
Brakes
2
The four wheel
hydraulically
operated
drum
brakes
are
fitted
as
standard
equipment to
all 1000 and 1200 models
Two
leading
sho
lype brakes
are
jilted
un
each
uf
the
front brake assemblies and
trailing shoe type
on
each
rear
assembly
The frunt brakes
use a
separate wheel cylinder
to
operate
each shoe whereas
the
rear
wheel shoes
are
operated by
a
single
ended
type whee
cylinder only
I
The
rear
wheel
cyJinders
aJso
incorporate
the
handbrake
operating
levers which
protrude from the
rear
backing
plates Handbrake cable pull applied
at the outer
ends of the levers allows the inner ends
of
the levers
to
operate
directly
on
the
rear
wheel cylinder pistons
The
rear wheel cylinders
are not rigidly
attached
to
their
respective
backing
plates
and
are
capable
of
sliding
on
the
plates
within limits
to
provide
a
self
centring
action
for the
rear
brake shoes
Each front
brake
shoe is
adjusted by
a
hexagonal
headed
earn which
is
located
on
the outer section
of the
brake backing plate
Rear wheel shoe
adj
stment
is made available by
a
single tapered adjuster unit bolted rigidly
on
the
brake
backing
plate positioned diametrically opposite
the
wheel
cylinder The adjuster
operates on
both shoe
at
the
same
time and
also
acts
as a
shoe
anchor when the brakes
are
applied
A square end
on
the outer
portion
of the
adjuster
and which
protrudes through
the brake
backing
plate
enables
rear
brake shoe
adjustment
to be
carried
out
The single and
the dual circujt
type
master
cylinders
are
operated directly
by
a
push rod
from the
pendant
type
brake pedal
The
hydraulic
system
incorporates
bleeder valves
at the
dual type
master
cylinder and
a
bleeder
valve
at
each of the
wheel cylinder assemblies
DISC BRAKES
As
a
safety item
for
high speed
driving
later model
J
200 vehicles
are
available with
front
wheel disc
type
brakes
The
caliper
assemblies
are
of
the
floating type and
are
allowed
to
float
in
a
lateral direction
As found with
most
disc
type
brakes
the assemblies
are
self
adjusting
and
require
no
adjustment
in service
As
pad
wear takes place
the
caliper piston
is allowed
to
slide
outwards
through its seal
to take
up a new
position
in the
caliper cylinder bore
When
the
brakes
are
in the
off position
a minimum of
clearance
is maintained
between
the
pads
and disc
Elastic deformation
of the
piston
seal
on
the piston
takes
place
when the brakes
are applied
and returns the
piston
to its normal off
position
when the brakes
are
released
TO REMOVE ANDINST
AL
2 SIX iil
E JIR UIT M STER
YLlNDIlIl
I
Raise the engine bonnet and fit fender
covers to
both front fenders
2 Disconnect the
brake
fluid
pipe
at
the front
end
of
the
master
cylinder and plug the
pipe
to prevent entry of
dirt
3 Remove the
spring pin and withdraw the clevis pin
from the
master
cylinder push
rod
clevis and
pedal
4 Unscrew the
two nuts
securing the brake
master
cylinder
to
the engine bulkhead and
remove
the
cylinder
NOTE Care should be exercised
when
removing
or
installing
the
master
cvlinder
assembly
to
ensure
that brake
fluid
is
not permitted to drop
onto
the
surrounding
paintwork of
the vehicle Brake
fluid if
accidentallv
spilt
should
be
immediately
washed away with
water
and then
allowed
to dry
natural
v
and
not wiped
with cloth
IIlstallation
is
a
reversal of the removal procedure with
attention to he
following
Fill the
master
cylinder
reservoir
with clean brake fluid
Bleed all
air from the system
as
described
in the
HYDRAULIC SYSTEM
section
Single Circuit
Type
Master
Cvlinder
Mounted
on
Engine
Bulkhead
Typical
131