BRAKE ADJUSTMENT PART 8: MAINTENANCE AND SERVICE
– 174 – Y53-6032 (R05/10)
tem. All of the following areas are interrelated and must
conform to original specifications:
•Tire Size
• Drum brakes
A. Cam Radius
B. Wedge Angle
C. Drum Radius
D. Brake Linings
E. Brake Chambers
F. Slack Adjusters
• Disc Brakes
A. Disc Rotors
WARNING! A nonconforming part in your
brake system could cause an accident involv-
ing 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 your brakes work for you
on the road. If parts don’t work together prop-
erly, you could lose control of your vehicle. Be
sure any replacement parts in your brake sys-
tem conform exactly to original specifica-
tions.
All vehicle operators should check their brakes regularly.
Always adjust your brakes when they are cool.
WARNING!
Do not use brake linings with a
thickness below the specified minimum. Such
linings will have lining rivets exposed that can
damage the brake drum and reduce brake effi-
ciency, which could cause death , personal
injury or system failure
Air System
• Build up air pressure in the system to the governor
cut-out point.
• Stop the engine.
• Release the parking brakes (push in the yellow knob).
• Watch the rate of air pressure drop. The rate of drop
should not be more than 2 psi (14 kPa) per minute.
• Now start the engine and build up the air pressure
again.
• Stop the engine. Ensure that the parking brakes are
still released (i.e., the yellow knob is pushed in).
• Fully apply the service brakes.
Y53-6032.book Page 174 Monday, May 24, 2010 3:37 PM
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