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pose of this is to remove all brake fluid and dirt
particles and should be carried out
in
connection with
the
comp lete
reconditioning
of the
hydraulic
system
and a new fitting.
When
comp lete recond
itioning
is
being
ca
rri
ed
out,
the brake
service unit (see
Gro
up
50)
can
suitably
be
co
nne
ct~cI
to the
master
cylinder
and then
the
system
emptied
"
: :,rough
the
venting
nipples.
The
system
should therefore
be flushed with
spi
rit, after which
it should be blown clean with
compr"
e ssed air.
When
such
a reconditioning
has been
carried
out, the
com-
ponents of
the hydraulic
system shou ld be
taken out
and checked
to
ensure
that
any dirt and
flu shing fluid
have been
effectively
removed.
N.B.
With regard to requirements concerning the
cleaning agent, see the
genera
l instruction s,
Group 50.
Do nol' fill
up
with brake fluid which
ha
s
been drain
-
ed
from the
system.
REPLACING THE BRAKE LINES
If leakage
occurs, or if the brake
lines
have been
exposed to
such
externai damage that
lea
kage
or
constriction can res
ult,
the damaged
lin
es
should
be
replaced
according to
th
e instructions
given
below.
If
th
e
replacement
concerns
the front brake hoses, it
should be carried out with the front wheels
unioaded
.
l
.
To prevent
unn
ecessary
spilling of brake fluid,
the
existing
filler
cap
on
the
master cylinder
container should be temporarily replaced with
one without aventing hole.
2. Clean
round the connections and remove
the
damaged brake
line.
3.
Take a completely new brake
line, blow it clean
internally
with moisture-free filtered compressed
air and fit it.
Make
sure that the brake
line lies in
such a position that it does not chafe while driv-
ing.
Particularly
important
points are where the
pipes pass the steering rod, where
they must not
come nearer than 10 mm
(3/8").
If a pipe
is
not
bent
correctly,
it
should be adjusted
manually
before being fitted.
Bending
a pipe already connected
of
ten
results
in
deformation at the connections.
The front brake
hoses must only be
fitted according
to
Fig. 5-19
and
always with the linkage
arms
unioaded.
Do
not forget the clips.
4.
Vent the brake
system according
to the instruc-
tions given below.
Fit
the filler
cap
with venting
hole on the
container.
VENTING THE
HYD;
R AUUC
SYS/TEM
A
sign
that there is air in the
system
is that the
brake pedal
can
be
depressed
without
any appreci-
able resistance,
or if it
feels spongy.
As soon as any part of the system
has
been removed,
venting must
be carried out. Air can a lso enter
the
system if
there
is
too
sma
ll
a
quantity of brake fluid
in the
co
ntain
er.
If,
for examp le,
only
a
wheel brake
unit
has been
removed, it
is
usually sufficient ju st
to
vent
this.
If,
on the
other ha
nd, the master cylinder
or
its
lines
have
been removed, the entire
brake
system
must be
vented.
When venting or other
similar
work
is
being
carried
out,
no
brake
fluid
must
be permitted to
get
on to
friction surfaces
or
lining
s. Do
not
spill
any fluid on
the paintwork
as this
may
damage
it. If the vehicle is
to be placed
on blocks during
the venting, the rear
end should
be
somewhat high
er than
the
front end.
When
f illing with
oil observe the following
:
The
brake
fluid must meet
the req uirements
according to
SAE
70 R 3.
Brake oil which has been vented out of
the
system
must
under
no
circumstances be put back
into
the
venting
unit or the container.
VENTING
WITH
THE
VENTING
UNIT
l
.
Check
that
there
is
full
travelon
the brake pedal
(about 152 mm=6", measurement
A, Fig. 5-62).
2.
Remove
the
ele
ctric switch from
the warning valve.
3.
Depress the brake pedal
several
times in order to
even out any partiai vacuum
in
the servo cylin-
der and
in
this way disconnect
it.
Clean round the cap
on the
brake fluid container.
If necessary
fill the container with brake fluid
up
to the "Max."
marie
Fig. 5·62. Pedal trave I
A=approx. 152 mm (6")
5:
25
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