PART 8: MAINTENANCE AND SERVICE BRAKE ADJUSTMENT
(R10/06) Y53-6007 – 153 –
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. 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 properly, you could lose control of
your vehicle. Be sure any replacement parts
in your brake system conform exactly to origi
-
nal specifications.
All vehicle operators should check their brakes regularly.
Always adjust your brakes when they are cool.
WARNING! Brake linings and pads with a
thickness below the specified minimum will
have exposed rivets. Use of such linings can
damage the braking surface and also reduce
brake efficiency, which could cause an acci
-
dent 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.
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