IMPORTANT: On slack adjusters equipped
with an adjusting screw locking sleeve, wipe
clean the locking sleeve area, and depress
the locking sleeve when positioning the
wrench or socket over the adjusting screw.
Do not try to turn the adjusting screw without
fully depressing the locking sleeve.
2.2 Turn the adjusting screw until it is tight;
then, back off the adjustment until the
drum is free. Normally, the adjusting
screw will need to be backed off 2 or 3
clicks.
2.3 To see if the drum is free, strike the brake
drum with a steel tool and listen for a
clear ringing sound. If a dull thud is
heard, the brake is dragging and further
adjustment is needed.
NOTE: Checking the brake adjustment when
the wheel is off the ground may be unreli-
able. Looseness or wear anywhere in the
wheel bearings will cause the drum to be
misaligned while the wheel is off the ground.
Check the brake adjustment with the wheel
on the ground.
IMPORTANT: On slack adjusters equipped with
an adjusting screw locking sleeve, make sure
that the locking sleeve is engaged around the
adjusting screw hexhead after adjustment, thus
locking the adjusting screw in place.
42–10 Camshaft Bracket
Bushing Lubricating
Pump multipurpose chassis grease (NLGI grade 1 or
2) into the chamber bracket until it appears at the
slack adjuster end of the bracket. See Fig. 5. Use
care that no grease enters the drum cavity. If grease
leaks out under the camhead, the camshaft grease
seal is worn or damaged, or is installed backwards.
NOTE: The use of meter-type fittings, having a
maximum 40 psi (275 kPa) pressure relief at
shutoff, is recommended.
42–11 Manual Slack Adjuster
Lubricating
Bendix Manual Slack Adjusters
Lubricate the slack adjuster with chassis grease
(NLGI grade 1 or 2). Apply enough grease to com-
pletely fill the body cavity.
f420008a
B
A
08/20/93
1
2
3
A. With the brakes released, measure this distance.
B. With the brakes applied, measure this distance.
1. Brake Chamber
2. Slack Adjuster
3. Adjusting Screw
Fig. 4, Brake Adjusting, Typical Manual Slack Adjuster
f420011a
05/28/93
1
2
3
A
A. Grease exit.
1. Brake Chamber
2. Slack Adjuster
3. Grease Fitting
Fig. 5, Camshaft Bracket Bushing Lubrication
Brakes 42
Business Class Trucks Maintenance Manual, October 1998 42/7
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