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Section 13
Brake Adjustment
1. Re-fix the drum and mount the
wheels.
2. Turn the adjusting nut of the
slack adjuster till the lining
touches.
3. Turn the adjusting nut in the
opposite direction for one or two
clicks so that the lining just
clears the drum. Rotate the drum
and check the running clearance
it will be around 0.25 to 0.40
mm.
4. While the brakes are not applied
check the distance between the
air-chamber mounting face and
the centre of the slack adjuster
clevis pin. Figure 88.
A = 72.0± 0.4 mm
Figure 88
If the reading is not 72.0± 0.4 mm.
Disconnect the yoke from slack
adjuster, slacken the lock nut.
Rotate the yoke as necessary and
refit.
5. While the brakes are applied.
measure the distance again
Figure 89.
Figure 89
6. The difference between the
above two readings is the stroke
of the air chamber this should
not exceed the prescribed limit.
Figure 90.
# B–A=
20 <4.45 cm (1 ¾ in.)
24 <4.45 cm (1 ¾ in.)
Figure 90
Keep the stroke as minimum as
possible.
7. Brakes are to be adjusted
whenever the stroke length
exceeds 44.50 mm.
B =...................
60
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