MAINTENANCE, LUBRICATION AND SERVICE
STEERING AND BRAKES MAINTENANCE
on a vehicle equipped with automatic
slack adjusters, a mechanical problem
with the slack adjuster, brake
components or improper installation of
the slack adjuster is indicated. If brakes
are found to be out of adjustment, the
vehicle must be taken to the nearest
repair facility to have the problem
investigated and corrected.
NOTE
The brake system is a critical vehicle
safety system. For your safety and for
those around you, follow the
recommended preventive maintenance
checks. If any problems occur, have them
investigated immediately by an authorized
service facility
Brake System Maintenance
1
Block the wheels to prevent the
vehicle from moving.
2
Start the engine and build air system
pressure to governor cutout.
3
Stop the engine.
4
Release the parking brakes.
5
Apply and hold the Service Brake.
6
Have an assistant check for proper
results by observing the movement
of the slack adjusters as indicated
below:
• The brakes on both the steering
axle or the rear drive axle(s)
should always apply as indicated
by movement of the slack
adjuster.
• Check for air leakage.
7
Set park brake when done.
Air Tanks
DANGER
Drain the air system tanks at the
recommended intervals. If condensation
accumulates, moisture can enter the
brake system air valves, causing corrosion
or clogging. The safety of the brake
system could be compromised, leading to
an accident causing severe personal injury
or death.
WARNING
When draining the air tanks, DO NOT look
into the area of the draining air. Dirt or
sludge particles may be in the air stream
that could cause eye injury.
Air tanks should be drained daily. Make
sure the drain cocks close properly after
draining. Empty moisture from air tanks
by pulling the drain valve lanyard or pull
cord. The tanks should be checked for
condensation uid, even if an automatic
drain valve is installed.
It is very important that the air system is
kept clean. If sludge or oil is found in the
drainage or an excessive amount of uid
is drained out of the tanks see your
authorized dealer.
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X Publication_PC28
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