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THE BRAKING
SYSTEM
M
Remove
~
blank,
replace
~
supply pipe,
and
6t
~
Cric:tion
pads
as
d=ribed in
Section
M.l2.
Finally, bleed tbe system (Section
M.2)
and
checl.
for lealo:s with the brakes fully applied.
Section M.lO
REPLACING
A
BRAKE
UNIT
The
replacement procedure is a reversal of the
instruc.
lions given in Section
M.7
"~th
the exception
of
tbe
following details. Replace the brake pads as detailed in
Section
M. l2.
Cheek the gap between each side of the
calliper
and
the disc.
Tbe
difference
should
not exceed {)10
in. (·2S4
mm.)
and the
shims
may be altered to obtain
this
figur..
Bleed the system as detailed in
Section
~.2
and,
finally,
elteck for leaks with the brakes fully
applied.
Section
M.ll
REMOVlNG THE
FRICTION
PADS
Remove
the nut, washer, and bolt securing the
keep
plate and withdraw
the
plate.
Withdraw
the
pad :mcm·
blies
with a
suitable
hooked
implement
engaged in the
hole
in
the lug of the
securing
plate.
Thoroughly
clean
the backing plate, dust
seal,
and
the surrounding
area
of~
calliper.
Section M.12
REPLACING
THE
FRICTION
PADS
Where
the
original friction pads are
to
be refined
it
is
only
necessary
to
reverse the
instructions
gi,en in
Section
M.ll.
If wear
has
reduced the pads
tO the
minimum
per-
missible
thickness
of
·25
in. (6·35
mm.)
the
pads
must be
renewed. Use service
tool
18G553 to press the piston
assemblies to the base of
the
cylinder bores against
the
resistance offered by the retractor
pin
and bush. Insert the
new
friction
pad assemblies, replace
the
keep plate, and
JCCUre it with
~
bolt, washer, and
nut.
Section
M
.
I3
R
ELINI
NG
THE HAND
BRAKE
Unscre\\ and remove the adjuster bolt and locknut and
swing the pad
carriers
away from the disc. Extract the
split
pin and withdraw the lever pivot pin
(see
Fig.
M.7).
MGA
(Twin
Cam).
Issue
3.
2n65
Fig. M .1
Th~
hand
broke
corrlu t:ampontnts
l.
Pad carrier
(outer).
1.
Trunnion.
2. Pad
carrier
Cmner).
'·
Pivot
pin.
3.
Pad$.
9.
Pivot
.sear.
4.
!..eYer.
10.
Sprinc.
s.
Adjuster
boll.
lt.
Sprin.a
n:uinin; nu.!.
6. Loc:k:nut.
t2. SJXins pbtc.
Rcmo,·e the bifurcated
rivet1
from
both
c:uricrs
and
prise off the
worn Unings.
Place the
new
linings in
position and
secure
them
_.;th new bifurcated
rivets.
Placo: the lever
in
the
position
indicated
in
Fig.
M.S.
Hold the locknut
firmly
against the
outer face o
f
the
trunnion
and screw in the
adjuster bolt unti
l
three or
four threads
engage in
the
locknut.
Alig.n
the holes
in
the
lever and
pivot scat,
fi1 the ph
ot
rin
.
and
lock
it
wilh a
split pin
.
Reset 1be clearance
as
detailed in
Seclion
M.14.
Section
M.14
ADJ
USTI.'IG T
HF.
HAND
BRA
KE
Adjustment to
compensate for pad "ear must
be
made
at the hand brake
units and not
on
the
relay lever
adjuster. The adjustmentS
should be made
in
the follow-
ing manner wben the travel
of
the
hand
brake lever
becomes excessi,.-e.
.\1.
7
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