BRAKES
The method detailed hereafter is suitable
only for the braking system
;
the procedure
to be adopted when bleeding the clutch
is detailed in the
"
Clutch Section
".
(a)
Ensure an adequate supply of Lock-
heed Brake Fluid is in the reservoir
of the Master Cylinder Unit and keep
the level at least half full throughout
the operation. Failure to observe this
point may lead to air being drawn into
the system and the operation of bleed-
ing will have to be repeated.
(b)
Clean the bleed nipple on one of the
wheel cylinders and fit a piece of rubber
tubing over it, allowing the free end
of the tube to be submerged in a
glass jar partly filled with clean
Lockheed Brake Fluid.
(c)
Unscrew the bleed nipple one full
turn. There is only one bleed nipple
to each brake.
(d)
Depress the brake pedal completely
and let
it
return without assistance.
Repeat this operation with a slight
pause between each depression of
rhe
pedal. Observe the fluid being dis-
charged into the glass jar and when all
sir bubbles cease to appear hold the
brake
pedd down and securely tighten
the bleed nipple. Remove rubber
tubing
only when nipple is tightened.
NOTE:
Check the level of the fluid in
the master cylinder frequently and do
not allow the level to fall below half
full. Seven or eight strokes of
thebrake
pedal will reduce the fluid level from
11.
full to half full.
(e)
Repeat the operation for the remaining
three wheels.
(f)
Top up master cylinder with Lockheed
Brake Fluid and road test car.
9.
LEAKAGE OF FLUID FROM
MASTER
CYLINDER
Leakage of fluid from the reservoir of the
master cylinder can be explained as follows
:
(a)
Overfilling which allows fluid to be
trapped in the filler cap and leak
through the breather hole. The fluid
level should never be higher than
1"
measured from the top of the filler
orifice or
4"
measured from the under-
side of the cover plate.
(b)
The breaking up of the filler seal due
to foreign matter between it and the
rim of the orifice.
(c)
Leakage has been traced to jets of
fluid from one of the cylinder recuper-
ating holes finding its way past a
defective filler cap sealing ring or
via the breather hole.
The latter condition can be corrected
by removing the cover plate and
turn-
ing it
180"
so that the filler
cap
is no
longer directly above the jets.
BRAKE
AND
CLUTCH PEDAL
ADJUSTMENT
The pedal adjustment is set when the
car
is assembled and should not require atten-
tion unless the assembly or adjustment has
been disturbed.
A
minimum
clearance of
.030
is necessary
between each push rod and the piston
which it operates, this free movement
can
be felt at the pedal pad when it is depressed
gently by hand.
The movement at the pedal pad will be
magmfied owing to the lenpth of the lever
and this movement
will
bec, ne between
9"
to
9".
Should this free
mcl,
.ent not be
apparent, first check that tne pedals are
free on their shaft and not prevented to
return
by
some other fault than irisufficient
clearance between push rod and piston.
ADJUSTING
THE
BRAKE
PEDAL
(a)
Loosen the jam nut on the shank of
the pedal limit stop screw and screw it
anti-clockwise approximately
Q"
away
from the master cylinder support
bracket.
(b)
Push the operating push rod end into
the master cylinder until it just contacts
the piston. Screw up limit stop screw
to meet the push rod fork end, but dc
not
allow the rod to be pushed furthe]
into the piston. Screw the jam nut sc
that it makes contact with the mastel
cylinder support bracket.
(c)
Unscrew the pedal limit stop screv
together
with
the jam nut so that a
.030
feeler gauge
will
pass between nu
and support bracket.
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