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c
BRAKES
PRESSURE TESTING
HYDRAULIC
SYSTEM
LEAKS
System
bled and
brakes correctly adjusted
I
•
HIGH PRESSURE TEST
-
Plug
the
master-cylinder inlet. (plug F).
- Connect-up
Testarc 50
gauge to
a
front bleed
hole.
-
Remove plug
(F).
- Bleed pressure gauge
(1)
when in the pos1t1on
ii ustrated
- With engine stopped "release"
servo-unit.
(by five
aopltcations of the brah
pedal).
- 504
with dual
circuit
master-cylinder
:
•
release a rear bleed screw (the tube should be 1rn
mnrsed in
the
fluid in the receiving vessel).
- Install
brake
depressing fixture.
-
Screw the
knurled nut
(a)
until the
slots
(b)
are
obsl'ured and then continue
screwing
a
further
10
turns.
- Wait a few movements to
allow
circuit
to stabilise.
-
Unscrew
the
nut
(a)
until the slots are iust visible.
- Align the two
2
needles
of
the H.P. gauge
(c).
There
should
be no fall in pressure after
an interval
of
15
minutes. If there is, then
there is a
leak.
Trace,
rectify
and
re-test.
NOT
E
-
A
leak
through the
main cup
of
the
masrer-
cylinder will
nor
be
indicated
by a fall
in fluid level
or by
traces
of
fluid
on
the outside.
Some
leaks
through cups and seals only show
at low pressure.
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