operators_manual

Auxiliary Transmission
Information about using the auxiliary
transmission.
If you have an auxiliary transmission, see
your transmission manufacturer’s manual
for its proper operation.
Brakes
Air Brake System
This vehicle’s brake system functions with
the use of compressed air generated from
the engine’s air compressor. The
compressed air is stored in various air
tanks to ensure that air pressure is
available whenever the driver needs it.
WARNING!
Do not drive through water deep enough to
wet brake components, as it may cause the
brakes to work less efficiently than normal.
The vehicle's stopping distance may be lon-
ger than expected, and the vehicle may pull
to the left or right when brakes are applied,
which could contribute to an accident involv-
ing death or personal injury.
Compressed air is delivered to the brake
system through the valve at the brake
pedal and is controlled with various valves
and braking circuits. The brake system is
designed with separate front, rear and
(when applicable) trailer circuits so that if
one circuit is compromised and loses air,
the other circuits will not be affected.
Safety valves in each circuit will protect the
other circuits in the event that a circuit
loses air.
The air compressor on the engine will
typically provide 100-130 psi (690-896
kPa) to the air tanks. The vehicle is also
designed with an air dryer, which removes
moisture from the compressed air in order
to protect all components in the air system.
The brake system may be further
enhanced by additional devices such as
brake proportioning valves, Anti-lock
braking systems or sensors designed to let
you know if your brake pads need to be
serviced. Certain conditions may result in
the brake surfaces getting wet. Brake
surfaces that are wet do not perform as
well as when they are dry. There may be
situations where wet brake surfaces cannot
be avoided. In such situations, apply the
brakes while in motion, to dry the brake
surfaces.
Certain conditions may result in your brake
surfaces becoming overheated (above
800°F or 427°C). Overheated brakes will
damage linings and drum surfaces,
ultimately decreasing braking performance.
Refer to Retarders and Descending a
grade to avoid overheating the brakes.
Parking Brake
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3
1. Normal Run Position
2. Trailer Park with Vehicle Released
3. System Park or Trailer Charge with
Vehicle Parked
DRIVING - Brakes
106 Y53-6096-1A1 (01/17)
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