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ANTI-LOCK BRAKING SYSTEM STARTING AND OPERATING THE VEHICLE
– 110 – Y53-6033
Regional Haul (R05/10)
Use engine compression to assist the service brakes by
not depressing the clutch pedal until the engine reaches
idle speed.
Overheated Brakes
Under normal braking conditions, the energy generated
will bring the internal brake drum temperature to about
500°F (260°C). This is well within the safe zone: the max-
imum safe temperature of lining for drum type brakes is
usually about 800°F (427°C).
But if service brakes are used for emergency braking,
used improperly, or for prolonged periods, internal brake
drum temperatures may exceed 800°F (427°C). Such
brake overheating may be detected by a burning smell or
smoke coming from a drum. If this occurs, you should
immediately stop and check for cracked brake drums or
lining fires. If neither exists, get back behind the wheel
and resume a slow speed as soon as possible to cool the
brakes. If the vehicle was to remain stopped, the heat
transfer could destroy the linings and distort the brake
drum.
To prevent drums from distortion while they cool down:
• Park the vehicle on level surface and block the
wheels.
• Release the parking brake and allow the brakes to
cool down. See page 103
.
Anti-Lock Braking System
This vehicle may be equipped with an anti-lock braking
system (ABS). This ABS reduces the possibility of wheel
lock-up. If a wheel is about to lock during braking, the ABS
will automatically adjust air pressure to the brake cham-
bers on the appropriate wheel(s) to prevent wheel lock-
up. The ABS is automatically turned on when the ignition
switch is turned on.
ABS Warning Lamps
Truck/Tractor ABS Warning Lamp
A truck/tractor ABS warning lamp illuminates when the
ignition switch is first turned on and will remain on until the
system self-test has been completed successfully. Nor-
mally, the ABS lamp will remain on until a speed of no
more than 9 mph has been reached and the speed sen-
sors have been checked for correct output. The lamp