MG MGB User Manual

M
THE
BRAKING SYSTEM
SERVO
CYLINDER
ASSEMBLY
9.
Use
thumb
pressure
to
prise
the
non-return
valve
from
the
servo
shell
and
extract
the rubber valve
mounting.
10. To
remove
the end
cover
from
the
servo
shell, locate
Service
tool
C2030*
over
the three studs
and
secure
tightly with suitable
nuts
(see
Fig.
M.11).
Turn
the
removal
tool
anti-clockwise
with
a
IA
in.
(13 mm.)
square
drive socket
‘T’ bar
as
far
as
the
stops
on
the
cover
will allow and
lift off the
cover.
11.
Turn
the diaphragm
support
so
that the
push-rod
retaining
key
faces
downwards.
Apply light
fluctuating hand
pressure on
the
support
into
the
shell; this will
allow the
retaining
key
to
drop
out,
releasing
the
support
from the push-rod under
pressure
of
the
main
return
spring.
Extract the
spring
from the
servo
shell.
11.
Bend back the locking
tabs
of the
servo
shell
to
slave
cylinder
securing
bolts;
remove
the
bolts, together
with the locking and
abutment plates.
Lift off the
servo
shell
and
retrieve
the
joint
washer from the
mounting
face of
the
slave
cylinder.
SLAVE CYLINDER
ASSEMBLY
13.
Pull
the
servo
push-rod and the
piston
assembly
attached
to
it
from the slave cylinder bore.
Slide
off
the plastic bearing,
rubber
cup
and
plastic
spacer,
noting
their relative
positions
for re■tting.
l4.
Prise
off the rubber seal
from
the
head of the slave
piston.
Open
the
retaining
clip with
a
small
screwdriver
to
expose
the
connecting
pin,
which
may
then be driven
out to
separate
the
piston
from the rod
(see
Fig.
M.12).
Inspecting
Examine
all
parts
for
faults
and
wear
and be
prepared
to
■t
new
rubber
parts
throughout.
If
the
air
valve
is
faulty,
a
replacement
kit
must
be
■tted.
Dust deposits
on
the
air
■lter, which
is
otherwise
in
good condition,
can
be removed
M0700
Fig.
MI 1
Using Service
tool C
2030*
to
remove
and
refit
the end
cover
*Obtainable
from: V.
L
Churchill
& Co.
Ltd.
M.12
M0690
Fig. M.12
The slave
piston,
with the
retaining clip withdrawn
to
expose
the
connecting
pin
1.
Piston body.
2. Retaining clip.
3. Connecting
pin.
4. Piston sea].
by blowing
through with
a
low-pressure air-line.
Do
not
use
a
cleaning ■uid
or
lubricant of
any
description
on
the ■lter.
Wash
all
original
components
of the slave cylinder
assembly
and
remove
light
deposits from the
cylinder bore with clean
brake ■uid.
If the slave
cylinder bore
is scored,
a
replacement
unit
will be
required.
Reassembling
Scrupulous cleanliness of all
parts
of the
servo
unit
is
essential. Lay
out
all
parts to
be assembled
on
a
clean
sheet
of
paper.
Use clean brake
■uid
as a
lubricant when
reassembling the hydraulic
components
of the
servo
unit.
SLAVE
CYLINDER
ASSEMBLY
15.
If
the
piston
and
push—rod
were
separated
in item 10,
a
new
retaining
clip and
connecting pin
will be
required.
Insert
the
chamfered
end of the
push-rod
into
the
rear
of
the
piston
and depress
the
spring
inside
it
to
uncover
the hole
in
the
end of the rod.
Fit
the
pin,
followed
by
its
retaining
clip;
see
that this
is
a
snug
■t,
and does
not
protrude beyond
its
groove,
otherwise
the bore
will become
scored.
Using
only the ■ngers,
bed the
rubber seal
evenly
into
the
groove on
the head
of
the
piston,
with the
lips
of
the
seal
pointing
away
from
the push-rod.
16.
Insert the
piston
into
the
lubricated bore of
the slave
cylinder, then,
one
by
one,
slide the
spacer,
the
rubber
cup,
and the bearing
over
the push-rod
into
the
mouth
of
the bore.
Take
care
not to
bend back the
lips of
either the
seal
or
the
cup,
and bed
in
each
part
individually.
MGB.
Issue
1.
80619

MG MGB Specifications

General

Brand	MG
Model	MGB
Category	Automobile
Language	English