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B
A
B
Rest position
Brake
appl ication
Fig. 5-14.
Funct
ion
of A.S.B. device
VOL VO
1,
20(
1
piston (and
thus a lso the brake pad) is pressed
aga inst
the
brake disc and
this
removes the clearance,
A.
If
distance
A
is now
greater than distance B, this
means that the
washer
(l,
Fig.
5-15)
is
pulling the
spring (2)
with it in
the direction of the brake disc.
When th
e
brake
peda
l
is released, the
piston is
moved ba
ckwards
by the
sea
lin
g
ring
(4)
so
that
clearances A and B are restored.
2 3
4
Fig. 5-15.
Bral<e calipe
r
with
A.S .B.
device
l.
Washer
2. Spring
3. Pin
4. Sealing ring
VOLVO
102900
If the
lateral movement of the brake disc
(when
driving on rough ground or round bends) should
now be
greater
than
distance A, the piston
is
moved
backwards into
the
cylinder.
Owing to the friction
between the
spring and
the
pin
in the
A.S.B.
device,
the lateral movement of the piston will not be
greater
than
that of the disc.
REPAI
R
I
NSTRUCTIONS
REPLACING THE BRAKE PADS
The brake pads
should
be replaced when
about 3 mm
(1/8") of the lining
thickness
remains. On
no
account
must the linings be worn
down to below 1.5 mm
(1/16").
Front wheel brake units
l. Remove the hub caps and
slacken
the
whee
l
nuts
slightly.
2. Jack up the vehicle and place blocks under
the
rear axle and front jack attachments. Unscrew the
wheel nuts and lift off the wheels.
3. Remove the hairpin -shaped locking clips for the
guide pins. Pull out one of the lock pins while
holding the damper
springs
in place.
Remove
the
springs and the other lock pin.
Draw
out the
pads, see Fig. 5-16.
4. Carefully clean out the
cavity
in which the pads
fit. If any of the rubber dust
covers
are
damaged;
they should be replaced. If dirt has penetrated
into the cylinder due to a damaged
cover,
the
5
:
10
brake unit
should be reconditioned. To provide
space for
the
new brake pads, the pistons must
be pressed
into
the cylinders with tool SYO 2809,
see Fig. 5-17.
It
should be noted that the brake
fluid
level
in the
master
cylinder
will then
rise and
the
brake fluid may po.ssibly spurt out.
Fig.
5-16.
Removillg the brake pads
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