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14
9
20
11
10
15
-
~9"
8 21
18
22
2
1
VOL
VO
102460
I .g.
5-59. The
brake valve d
ismantled
1. Plug
2.
O-
ring
8.
Pi ston seal
9. Bracket
le.
Sp
ring
11
.
Retain
e
r
14. Spring hou sin
g
15.
Retain
er
18. O-ring
20.
Hou
sing
21. Pi ston
.
22.
Val
ve no
usin
g
2. Sc
rew out the plug
(l)
and
press
out th
e
plunger
complete, see Fig
. 5-59.
3.
Clean
th
e
hydraulic
part, see
under
the
heading
"Cleaning",
Group
50.
4.
Inspect
the parts.
If
the cylinder surfaces are
scratched or damaged by
rust, the valve
should
be replaced complete. However, if the cylinder
surfaces are not damaged,
replace
only
thc
piston
complete. When doing so, check that
the
'Se
a
I is
facing
in the
direction shown in the Fig. 5-60.
5. Fit the piston
(21)
complete af
ter
havmg coated
it with a brake
fluid
or a
light
layer of
brake
paste. Screw
in the
plug
(l)
together with
the
seal-
ing ring
(2).
The
tightening
torque is
10-
12
kgm
(70-
85
Ib.ft.).
6. Place the container
(11) in the hou.:;ing
(14) and
turn it
according to Fig. 5-41. Place
the
retainer
(15) in the
spring
(10)
and
insert it in
position
in
the housing.
Now
fit the housing on the hydraulic
part with help of
screws
(16), washers and nuts.
Fig. 5·60.
Piston seal
5
:
24
INSTALLING
Screw the brake
valve
on
to
the brake
hose,
see Fig.
5-58. Place the valve in position
and check
that there
is nO;'ension in the hose.
Fit
the attaching
screws
and co nnect up 'the bra ke p ipe. Tighten the
connec-
tion s. Vent th
e
b
ra ke
sy
stem.
ADJUSTING
The adju sting
sc
rew (12, Fig
.
5-41)
is not
intended for
adju stin
g
in th
e
norm
a
l
mea
nin
g of
th
e word. Its
function is to balan ce th
e va
riation
s
in th
e ma
nu
-
f
actu rin
g. The ca
refully
checked ad
ju stment made
at
th
e
initial
asse
mbling
is ge nera
lly suffi cient f
or the
enti re
li
fe
ti
me of the va lve. For
thi
s reason, the
ad
ju
sting
screw
must not be touched.
If, after recond iti
o ning,
it has been establis hed with
the he lp of
test
ing accord ing to "Fau lt Tracing", para-
g rap
h 9,
Gro up 50,
th
at the o utgoing press ure lies
outside t he lim it va
lu
es, a
n adju
stment ca
n
be made
w ith t he ad
ju sting
screw. Turn
in
g the
screw
clock-
wi
se
i
ncreases
th
e o
utg
o ing press ure. Loc
k th
e screw
finally
a
f
ter t urn
in
g. The tig hte
nin
g torq ue for the
lo
cknut is
2.5-3.5
kgm
(8-25
Ib.ft. ). The ad
ju
stment
may only
be
carri edou
t after
reconditi
o
nin
g.
BRAKE LINES
CLEANING
The brake
lines
ca
n be cleaned by flushing them with
brake
fluid
or spi rit and then by blowing them clean
with moisture -free filtered compre ssed
air.
The
pur-
5
6
3
2
/
Fig .5-61.
6- bra
nch
union
l.
Secondary circuit from warn
in
g valve
2. Secondary
circuit,
right
front
wheel
3.
Primary circuit,
right front wheel
4.
Primary circuit
warning valve
5.
Primary
cir _uit,
leH
frC" ·-t wheel
6. Secondary
circuit,
leH
front wheel
VOLVO
1031 98
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