operators_manual

them to the specifications to
determine if the pads need to be
replaced.
Have a qualified mechanic perform a
detailed inspection if the notches are not
found. The pads and rotors should be
measured and compared against the
manufacturers specifications located in the
brake manufacturer
’s service manual.
Inspect Disc Brake Caliper for
Running Clearance
Regularly inspect caliper for Running
Clearance:
1. Stop the vehicle on level ground
and let the brakes cool down. Hot
brake calipers can burn skin on
contact.
2. Chock the wheels.
3. Temporarily release the parking
brakes.
4. Grab the caliper and move it. This
movement is Running Clearance.
5. Proper Running Clearance is 0.08
in. (2 mm) of movement of the
brake caliper (approximately the
thickness of a nickel) in the
inboard/outboard direction.
Have a qualified mechanic provide further
inspection if the caliper does not move or
appears to move more than the specified
clearance
Auto Slack Adjuster
The auto slack adjuster is a mechanism to
maintain the correct amount of space
between the braking surface and the
friction material.
1. Retracted position, no brake pedal
applied
2.
Applied position, brake pedal
engaged
Drum Brake Inspection
Have brake drum linings inspected by a
qualified mechanic for wear at regular
intervals according to the maintenance
schedule. In severe service or of
f-highway
applications inspect the linings more
frequently. In addition, periodically check
the brake chamber stroke. Replace the
slack adjuster if proper stroke cannot be
maintained.
Operational checks of automatic slack
adjusters
1. Start the vehicle and get the air
system up to normal operating
pressure. Do not apply the parking
brake.
2. Apply pressure to the brake pedal
and measure the distance the air
chamber pushrod traveled.
3. Compare the results to the
specification to determine if the
automatic slack adjusters need
replacing.
MAINTENANCE - Brake System
192 Y53-6096-1C1 (09/20)
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