And Instal - Datsun 1000 Workshop Manual

3
Brakes
Adjust
the brake pedal
height
See rel
vant
section for
adjusting procedure
Check the master
cylinder for fluid leaks
TO DISMANTLE
I
Remove the
reservoir cap and
seal and drain the
fluid from
the
cylinder reservoir
2 Pull back
the dust boot from the
rear
end of
the
cylinder
and with
a
suitable pair
of
snap
ring pliers
remove
the snap
ring
3 From the
rear
end of the
cylinder
withdraw the
push
rod assembly with dust boot piston primary
cup
return spring
check valve and check
valve seat in that
order
4
Remove the
secondary
cup
from the
piston being
careful
not to
SCore
the
piston
5
Loosen the
reservoir to cylinder retaining clip
and
detach the reservoir
TO
CLEAN
AND INSPECT
I
Wash
all
component parts
thoroughly in
clean
brake fluid
or
alcohol
2
Check the
master
cylinder
bore for
excessive
wear
scoring or
pitting
3
Inspect
the piston
for
pilling
excessive
wear or
scoring
4
Check the piston
to
cylinder
clearance and
renew
the
piston
and
or
cylinder if the clearance
is in
excess
of
that
specified
see
SPECIFICATION
section
for
piston
clearance limit
5
Check the lips
on
the
primary
and
secondary
cups
for
wear
and the check valve
rubber fnr swelling
perforation
or
distortion
6 Check the
piston compression spring
for
weakness
or
rusting
7
Renew
all
oomponen
ts
of the
cylinder
assembly
that
upon
checking
prove
to
be
unserviceable
NOTE It is
always
advisable
tu
instal
new
UPS
check valve
and
dust boot
to a master
cylinder that has been
dismantled
This
l
ill
ensure a
thorough
overhaul and
long
service
from the
unit
TO ASSEMBLE
I Soak all
internal
components of the
cylinder in
c1ean
hydraulic
brake fluid before assembling
2
Carefully
instal
the
secondary
cup
to its
recess
in
the
piston
Ensure that the leading lip of the cup
is
facing to the
front of the
piston
3
Instal the check valve
seat
check valve spring
primary cup and piston
in
that
order into
the
rear
end of
the
cylinder
Ensure that the
leading lip
of
the
primary
cup
is
facing towards the
front
of the
cylinder
4
Fit the
push
rod
assembly to
the
rear
of thc
cylinder and instal the
snap
ring
5
Instal
the
dust boot
to
the
rear
of
the
cylinder
making
sure
that
the
dust boot
is
positioned
correctly
over
its
retaining lip on
the cylinder body
6
Attach the reservoir
to
the
cylinder
and fit and
securely
lighten
the reservoir retaining dip
7
Fill the reservoir with clean
hydraulic
brake fluid
8
Fit the reservoir
cap
and seal and bleed the
cylinder by
hand
by slowly pumping
the
piston
via
the
push
rod
at
the
rear
of
the cylinder
until all
trapped
air is
expelled from
the
cylinder
eN AND SEAL
V
C
p
RESERVOIR
SECONDARY
CUP
rs PIN
PRIMARY
CUP
CHECK VALVE SEAT
A
f
0
1
BOOT 1
cUP
J
il ll
Q
1
ON
I
CHECK VALVE
cyLINDER
BODY
SPRING PIN PUSH ROO ASSV RETURN SPRING
Dismantled View of
Single
Circuit
Type
Master
Cylinder
J
nu u IR UIT M ST II
UND
The dual circuit type
master
cylinder assembly was
introduced
as a
safety factor
on
later type vehicles and
can
be of
either Nabco
or
Tokico manufacture
The
front and
rear
brakes
are
applied
by independant
circuits
If
a
malfunction
occurs
in
one
circuit
the
remaining
circuit is
capable
of
stopping
the vehicle safely
A brake line pressure
differential warning
light
switch
if
corporated
within the
system
allows
a
bulb to
glow
on
the dash
panel
when
a
malfunction
occurs
within the
system
The switch
is
actuated by
a
shuttle
valve
when
a
pressure difference of lH
hu
3
and
17
kg
185
and 242
psi
is
encountered between the
two hydraulic
circuits
NOTE The
complete
switch assembly should be renewed if
it is
found to
be
unserviceable Under
no
circumstances
should
an
attempt be made to repair the
switch
132