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HANDBRAKE
DESCRI PTION
The construction
of the handbrake is
shown
in
Fig.
5-78. The
handbrake lever is mounted on the
f100r
on the outside of
the driving seat. The
movement
of
the
lever is
transm
itted via the
shaft
(4), lever
and
pull rod
(5) to the
pulley
(6).
From
here
the
movement
is
transmitted through the cable
(7)
to the
rear wheel
brake units. At each rear wheel, the movements of the
cable influence the
lever (16),
which is carried in a
movable rod
(17)
on the brake shoes. The
lower
ends of the brake shoes are
held
pressed against the
anchor bolt
(18)
by the
lower
spring. The
upper
ends
are
jointed
through
the
adjusting devices
(15)
to which
they are
held
pressed by
the
spring
(14),
which also
locks the
small serrated wheel of
the
adjusting screw.
Due to this
type
of suspension,
the
brake shoes are
self-centring and both
the
shoes are partly
self-apply-
ing
(Duo-Servo).
The brake drum is fitted on
the
drive
shaft and so designed that it also serves as a brake
disc for the footbrake.
When the handbrake
is
applied, the lever and rod
press the shoes against the brake drum. When the
wheels or drive shaft attempt to turn the drum, the
shoes accompany the rotation because of the friction
between
lining
and drum. Due to the
"floating"
sus-
VOLVO
1043 26
Fig. 5-78.
Handbrake
system
1.
In
s
id
e
su
pport
atta
c
hment
12.
Bra
ke
drum
22.
Pa
w
l
2.
Rubber cover
13.
Bra
ke s hoe
23. Ra
tchel segmenl
3.
Leve
r
{seco
nd
a
ry
s
ho
e}
24
. Ri vel
4.
Shaft
14.
Relurn
s
prin
g
25.
Oulsi
d
e
su pport
a
tt
achmen
l
5.
Pull
ro
d
15.
Adjusling d
evice
26.
Wa rning
va lve sw ilch
6.
Pulley
16. Lever
27.
Pu
s
h rod
7. Cable
17. Link
28.
Handbrake lever
8.
Rubber
co
ver
18.
Anchor b
o
ll
29.
Spr
ing
9.
Front attachmenl
19. Relurn
s
p
ring
30.
Pu sh b utt
o
n
10. Cable
si
eeve
20.
Re
ar a1t
ac hme
nl
11
.
Attachmenl
21.
Rubb
er cab le gui
d
e
5
:
33
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