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Fig
. 5-31.
Checking
th
e run -out
BRAKE
DISC
VOLVO
10 1875
The brake dis
c
should be e xamined with reg ard
to
the friction surface, run-out thickn
e
ss.
Small marks on the friction surfa ce or linings
are
of
minor importance, but radial scratches reduce th
e
braking effect and increase wear on the linings. The
run-out
must n~t exceed .1 mm
(.004")
for the front
wheel brakes and .15 mm
(.006")
for the rear wheel
brakes
at the outer edge of
the
disc and
is
measured,
for
example, according
to
Fig. 5-31. Check first that
the wheel bearings
are correctly adjusted and
that
the
disc
fits
securely
on the hub.
The
thickness is
measured
with, for example, a
micrometer. It
should
not vary
more
than
.03
mm (.0012") when the
dis.
c
is
rotated one turn, since this
can cause avibrating
brake
pedal.
If
a fault is discovered during
the
above-mentioned
inspection,
the
brake
disc should be replaced. When
5
:
16
Fig
.
5-32.
Remov ing the brake d isc
VOLVO
10 1876
doing thi s, th
e
b rak
e ca
li
per
shoul
d first be re mo ve
d
.
The
n un screw th
e
lock bol
ts a
nd lift off th
e
brake
disc,
see
Fig s. 5-32
a nd 5-85.
Tap on the inside of the
disc with
seve
ral light
blows
from
a
pla sti
c
hammer
or similar tool. When fitting, che ck that the contact
surface is clean
.
If
for any reason, a new bral, e disc
is not
available,
the old one can be reconditioned by fine turning
.
Here accurate aligning of the disc is required and
machining should be carried out on
both
sides. After
the
machining,
the
thickness
of the disc must
not be
less than
11.6 mm (.457") for the front wheel brakes
and 8.4 mm (.331") for the rear wheel
brakes.
The
SUf-
face irregularity should be max. 3
jJ.,
measured on
an
arbitrary diameter and max. 5
jJ.,
measured
radially.
Af
ter
the reconditioning, the disc must not
have
a run-
out
of
more than .1
mm
(.004")
and its
thickness must
not vary
more than .03 mm
(.0012").
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