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Fig.
5·19. Fitting
th
e
front brake hoses
l.
Connection for
the
primary circuit
2. Connection
for the
secondary ci
rcu it
3.
Upper
brake
hos
e
4.
Lower
brake
hose
RECONDITIONING
5. Clip
6.
Connection
fo
r lowe
r
wheel
unit cylinder
7.
Connec1ion for
upper
whee
l
unit
cylinder
THE WHEEL BRAKE
UNr
l TS
Front brake calipers
REMOVING
VOLVO
\0\
866
When working with the
hydrau
li
c system,
observe the
instructions
under
"Cleaning"
and
"Brake fluid",
Group SO.
l.
Remove the hub caps
and
slacken the wheel nuts
slightly. Temporarily plug
the venting hole in the
brake fluid container
cap
to reduce leakage.
2. Jack up the front
end
and place blocks under the
front jack attachments. The
linkag
e
arms should
be off·loaded so that the brake hoses can be
fitted in the correct position. Unscrew the wheel
nuts
and
lift
off
the
wheels.
VOLVO
10 1867
Fig. 5-20.
Front wheel brake unit filted
1. Front
whee
l
brake
caliper
2. Lower vent
in
g
nipple
3. Uppe
r
venting nipple
4. Connection for
lower
whee
l
unit
cylinder
5
:
12
5.
Al1aching bolt
6.
Connec1ion
for
upper
whee
l
unit
cy
lin
der
7. Al1aching bol!
4
5
6
7
Fig. 5-21. Removing the front wheel brake
ca liper
3. Remove
the clip
(S,
Fig. S-19).
Disconnecf. the
con-
nection
(2)
and the
lower
hose
(4)
from
the
bracket. Place the protective
cas
ing
on the brake
lines
to
prevent
unnecessary
leakage.
Discon
-
nect the
connection
(6) for
the
upper hose from
the brake.
4.
Unscrew the attaching bolts (S and
7, Fig.
S-20)
and remove the brake
ca
liper,
see Fig.
S-21.
DISMANTLING
l. Remove the hairpin-shaped retaining clips for the
retaining pins. Pull out one of the retaining pins
while holding the damping springs in position.
Remove the
springs
and the other retaining pin.
Pu
ll
out
the pads, compare Fig. 5-8.
2.
Remove
the
retaining rings for the rubber dust
covers. Place a piece of wood, similar in shape
to
that
shown in Fig. 5-3, between the pistons
and press
them out
against
the
wood with the
help
of compressed a ir, see Fig. 5-22. The pistons
can
then
be easily removed. Prise off the rubber
dust covers.
3. Remove
the
sealing rings with the
help
of a
blunt
tool.
Be carefu
l
not to
damage
the
edge of
the
grooves.
Unscrew
the
venting nipples
and a
lso
the brake
lin
es.
N.B.:
Both
halves of the brake
ca
liper
shou
ld
not be
separated.
The reClSon for this
is
that
the
assemb
lin
g
requires
test
pressure
eq uipment
and special fluid
for
the bolts.
iNSPECTING
Before inspecting clean
a
ll
the
parts accord
in
g to the
instructions
given
under "Cleaning",
Group 50.
Make
sure
that the
channe ls are
clean.
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