Navistar WorkStar Series, Operator'S Manual

Page: 185 / 258

Maintenance Instructions
Air Brakes
Inspection and Adjustment
WARNING
Always chock the wheels when manually
releasing the spring brakes, or the vehicle could
roll causing property damage, personal injury, or
death.
WARNING
Under no circumstances should the spring
brake section of the spring and brake chamber
be disassembled.
Disassembly will release a
powerful spring which could result in property
damage, personal injury, or death.
WARNING
Brake Automatic Slack Adjusters (ASA’s) should
not need to be manually adjusted in service.
ASA’s should not routinely have to be adjusted
to correct excessive push rod stroke. Excessive
stroke indicates that a problem exists with the
foundation brake, ASA, brake actuator, other
brake system components, or their installation
or adjustment.
In the event that a manual adjustment must be
made (although this should not be a common
practice),
a service appointment and full
foundation brake, ASA, and other brake system
component inspection must be conducted as
soon as possible to ensure the integrity of the
overall brake system prior to returning the vehicle
to service.
Failure to follow this warning may result in
property damage, personal injury, or death.
A regular schedule for periodic cleaning, lubrication, adjustment
and inspection should be established, based on the type
of vehicle operation.
It is difficult to predetermine an exact
maintenance interval (time or mileage), since vehicles will be
used in a wide variety of applications and conditions. If you
are uncertain of the proper schedule and procedures for your
vehicle, contact your International dealer.
Periodic checking of push rod travel or brake adjustment is
essential for good braking. Push rod travel should be checked
every service interval to determine if adjustment is necessary.
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