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Master Cylinder Overhaul
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Prior to commencing work on the master cylinder
it is desirable to obtain a supply of new Lockheed
Series 329 Fluid in a sealed container. Where
supplies are unobtainable and the fluid may have to
be re-used, it is suggested that fluid is collected
in a clean jar or receptacle by means of a short
length of clean rubber tubing from the bleed screw
to the collecting jar. Release the caliper bleed
screw one full turn and operate the hand brake
lever a number of times until the master cylinder
reservoir is empty. Close the bleed screw and
detach the drain tube. Store the collecting jar
safely and cover carefully to prevent dirt ingress.
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Master Cylinder Removal
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1
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Disconnect the brake stop light pressure switch
spade terminals and lift away the plastic switch
cover exposing the hose union into the master
cylinder.
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2
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Detach the hose from the master cylinder.
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3
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Remove the four switch casting screws and lift
away the master cylinder complete.
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Master Cylinder Dismantling - See Fig.
H16
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1
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Remove the reservoir cap and bellows seal.
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2
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Remove the brake light pressure switch.
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3
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Remove the pivot bolt locknut and withdraw the
pivot bolt and lever.
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4
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Carefully prise the boot circlip from the lower
end of the master cylinder. This can be achieved if
care is taken to lift three or four adjacent
segments progressively, a little at a time until
the circlip is tipped sufficiently to clear the
mouth of the cylinder bore.
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5
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The boot is located into the piston and is best
removed with the piston. Lift the piston out
complete with boot and secondary cup.
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6
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Remove the primary cup washer, primary cup
spreader, spring and bleed (or trap) valve
assembly. To dislodge these items it may be
necessary either to bump the casting on a block of
clean soft wood to dislodge them or alternatively
to apply gentle air pressure at the hose union bore
and blow the parts free.
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