Brakes And Master Cylinders - MG Midget 1979 Driver's Handbook Manual

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Wheels and 'Ty res
TYRES
Tyre ma rki ngs
Max. load and inflation figures. Tyres are marked with the maximum load
and
inflation pressure figures. When fitting replacement tyres ensure that they
are
to the same specification and marking. The permissible load and tyre
pressures
are shown on page 73 of this handbook.
Wear indicator. Tyres fitted as original equipment have wear indicators
incor-
porated in their tread pattern. When the tyre tread has worn down until 0·06
in
(1'5
mm) of the tread is remaining the wear indicator bar will appear across
the
full width of the tread pattern.
Tyre
Tyres, including the spare, must be maintained at the pressures
recommended
maintenance
(see 'GENERAL DATA'); check with an accurate tyre gauge at least once
a
week, and regulate as necessary. Pressures should be checked when the tyres
are
cold; do not reduce the pressure in warm tyres where the increase above th
e
normal pressure is due to temperature. See that the valve caps are screwed
down
firmly by hand. The cap prevents the entry of dirt into the valve mechanism an
d
forms an additional seal on the valve, preventing any leakage if the valve core
is
damaged. The spare wheel supplied with new cars is inflated above the
recom-
mended running pressure. The pressure must be checked and adjusted before
use.
Excessive local distortion can cause the casing of a tyre to fracture and may
lead
to premature tyre failure. Tyres should be examined regularly, especially
for
cracked walls, exposed cords, etc. Flints and other sharp objects should
be
removed from the tyre tread; if neglected, they may work through the
cover
.
Any oil or grease which may get onto the tyres should be cleaned off by usin
g
fuel sparingly. Do not use paraffin (kerosene), which has a detrimental effect
on
rubber.
Tubeless tyres
Normally a tubeless tyre will not leak as a result of penetration by a nail or othe
r
puncturing object, provided that it is left in the tyre. At a convenient time hav
e
the tyre removed for vulcanizing. If a small diameter puncture has been made
a
temporary repair can be carried out with the tyre manufacturer's plugging kit
.
NOTE: The insertion of a plug to repair a puncture in a tubeless tyre must
be
regarded as a temporary measure and a permanent vulcanized repair must be
made
as soon as possible; In no circumstances should a plug repair be made to
the
side wall of a tyre.
BRAKES AND MASTER CYLI
'NDERS
Brake and
The level of the fluid in the brake master cylinder reservoir is visible through the
clutch master
plastic reservoir
(1);
the level must be maintained up to the position marked (2)
cylinder
on the side of the reservoir.
Fig. 1
To check the level of the fluid in the clutch master cylinder reservoir
(3),
remove
the plastic filler cap. The fluid level must be maintained at the bottom of
the
filler
neck.
Use only Lockheed Universal Brake Fluid (Series 329S) or Castro" Girling
Brake
Fluid; alternatively, use a brake fluid conforming to F.M.V.S.S. 116
D.O.T .3
specification with a minimum boiling-point of 260° C
(500°F).
Before
refitt
ing
the
filler caps check that the breather holes (indicated by the arrows) in the
caps
are
clear. The centre disc (4) of the brake reservoir cap may be removed for
cleaning.
Brake pedal
A free movement of
t
in (3'2 mm)
(A),
measured at the pedal pad must
be
Fig. ·2
maintained on the pedal. To
adjust
the free movement, slacken the stop light
switch locknut
(1)
and turn the
switch
(2) clockwise to decrease or anti-clockwise
to increase the
clearance.
Tighten the stop light switch locknut.
The instructions gi 'en for
the
temporary repair of tubeless tyres must be
dis-
regarded when tubes are fitted. If in any doubt, consult your authorized
Austin
regarueu as a
temporary
measure anu a permanent vuicamzeu repair must De
maue
as soon as possible. In no circumstances should a plug repair be made to
the
side wall of a tyre
.
Fig. 1
Fig. 2
The instructions gi 'en for
the
temporary repair of tubeless tyres must be
dis-
regarded when tubes are fitted. If in any doubt, consult your authorized
Austin
MG
Dealer.
Tu bes
When repairing tubes, have punctures or injuries vulcanised. Ordinary
patches
should only be used for emergencies. Vulcanising is absolutely essential for tu
bes
manufactured from synthetic rubber.
:Replacement
Radial-ply tyres are standard equipment and replacements must be of the
radial-
ply type.
Wheel and tyre
Unbalanced wheel and tyre assemblies may be
responsibl~~
for.
a~n~rm~l
~~~
Fig. 1
Fig.
2

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