• Disc rotors
All vehicle operators should check their
brakes regularly.
Air Disc Brakes
This vehicle may have disc brakes instead
of drum brakes.
1. Brake caliper
2. Caliper mounting flange
3. Brake rotor
4. Inspection notches
How to inspect brake pads on disc
brakes
To inspect the brake pads:
1. Park on level ground and chock the
wheels.
2. Temporarily release the parking
brakes.
3. Looking from the ground up at the
bottom of the caliper and rotor,
compare the relative position of two
notches; one located on the caliper
and the other on the carrier.
4. Take a measurement from between
these two notches and compare
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
MAINTENANCE - Brake System
218 Y53-6076-1D1 (09/20)
5
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