MG MGB User Manual

M
THE
BRAKING SYSTEM
SERVO
CYLINDER
ASSEMBLY
17.
18.
19.
20.
21.
Grip
the
slave
cylinder
in
a
soft-jawed
vice, position
the
mounting
face
joint
washer and
refit
the
servo
shell.
After correctly
positioning
the abutment plate
and locking plate,
which
must
be renewed if
it
has
been used
more
than
once
previously,
tighten the
three bolts evenly
to
the
torque
figure
given in
‘GENERAL
DATA’ and
tap
up
the locking plate tabs.
Pull
out
the push-rod
to
its
limit,
fit the
main
return
spring
followed by the diaphragm
support,
with
its
key slot
facing upwards. Make
sure
that
the
two
end
coils
are
located round
the
abutment
plate and
support
boss respectively. Press
the
support
into
the
shell until the
groove
in
the end of the push-rod aligns
with the
key slot,
and
insert
the key.
Ensure that both
the rubber
diaphragm and
its
support
are
perfectly dry and then
fit the diaphragm
to
the
support.
Gently
stretch the diaphragm
to seat
its
inner
edge
in
the
groove
of the
support.
Smear
the
outer
edge
of the rubber diaphragm
with
Lockheed Disc Brake
Lubricant
where
it
will
contact
the
rim
of the end
cover
and
of
the
shell, and
position
the
diaphragm evenly
around the
rim
of the shell.
Refit and
secure
Service
tool
C2030*
to
the
end
cover
(see
Fig.
M.11).
Position the end
cover
with the shell
so
that the elbow
will be
in
alignment
with the
air
valve.
Whilst
maintaining
a
downward
pressure on
the
cover,
turn
it
clockwise
as
far
as
the
stops
will allow,
taking
care
not to trap
the edge of the
rubber
diaphragm.
Remove
the
Service
tool.
Push
in
the
non-return
valve
with
its
rubber
mounting.
M.l4
AIR
VALVE
ASSEMBLY
(Fig. MIC)
22.
23.
24.
25.
Using only the fingers, fit the
rubber
cup
to
the
spigot
of the
air
valve
piston,
with the
lips
pointing
away
from the
drilled head,
and
insert
the
piston into
its
bore,
spigot
end ■rst.
Do
not
bend
over
the lips
of the
cup.
Fit the
valve housing, with
its joint
washer,
to
the
mounting
face
of the
slave cylinder
and tighten the
three
securing
screws
to
the
torque
■gure
given
in
‘GENERAL
DATA’.
Insert
the
spigot
of the
diaphragm
support
into
the
drilled head
of the
air
valve
piston,
and
then fit
the
inner
edge of the
air
valve
diaphragm
into
the
groove
of
its
support
and align the
screw
hole
slots. Do
not
use any
lubricant.
Refit
or
replace .the
filter
and snap—■tthe
dome
cover
if these have
been
removed
in item
(6).
Place
the valve
cover over
the
diaphragm
making
sure
that
the
projections
on
the
under surface of the
cover engage
in
the
slots of
the diaphragm.
Tighten
the five
securing
screws
■rmly,
progressively and diametrically;
do
not
overtighten,
since
the smallest
air
leakage
into
the
air
valve assembly
will
impair
the
action
of
the
servo.
26. Re■t
the
rubber
pipe
to
join
the
end
cover
elbow
to
the valve
cover
port.
Refitting
27. Reverse the
removing
procedure,
items 1
to
4.
28. Bleed the
braking
system
using
clean Lockheed
Brake
Fluid.
Fluid
drained from
the
system
or
that used for
bleeding
should
be discarded.
,MGB.
Issue
1. 80619

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English