User Manual

WARNING
DO NOT use any replacement part in
the
brake system unless it conforms
exactly to original specifications. A
nonconforming part in your vehicle's
brake system could cause a malfunc-
tion resulting in an accident causing
death or personal injury. Sizes and
types are so related to one another
that a seemingly unimportant change
in one may result in a change in how
well the brakes work for you on the
road. If parts do not work together
properly, you could lose control of your
vehicle, which could cause a serious
accident.
Brake adjustment and brake balance must
be set carefully to (1) make the most
efficient use of the forces available for
braking and (2) allow equal stopping forces
at all wheels. Once a brake system is set
to specifications, changing any one of its
components or any combination of
components may cause the system to not
work as well. All parts have to work
together to perform as they should. Any
replacement components in your brake
system should be exactly equal to the
original components. Any changes from
the original specifications can af
fect the
whole system. All of the following areas are
interrelated and must conform to original
specifications:
• Tire size
• Drum brakes
• Cam radius
• Wedge angle
• Drum radius
• Brake linings
• Brake chambers
• Slack adjusters
• Disc brakes
• Disc rotors
All vehicle operators should check their
brakes regularly.
Air Disc Brakes
Have brake pads inspected by a qualified
mechanic for wear at regular intervals
according to the Preventive Maintenance
Intervals on page 173. In severe service or
off-highway applications inspect the linings
more frequently.
Regularly inspect for pad/rotor wear:
• Park on level ground and chock the
wheels.
• Temporarily release the parking
brakes.
• Compare the relative position of
two notches; one located on the
caliper and the other on the carrier.
See the illustration below to
determine if the brakes require a
detailed inspection by a qualified
mechanic.
• 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.
MAINTENANCE - Brake System
212 Y53-6113-1A1 (11/20)
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