Paccar Peterbilt 567 2021, Руководство пользователя

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The ABS lamp flashes slowly during off-
road mode engagement. This is done to
alert you of a modification to the ABS
control software. At speeds above 25 mph
(40 km/h), the ABS controller operates in
the normal on-highway mode. At speeds
between 10 and 25 mph (16 and 40 km/h),
the ABS control software is modified to
allow short periods (0.25 seconds) of
locked-wheel cycles. At speeds below 10
mph (16 km/h), the ABS control software is
turned off to allow locked wheels. When
the Off-Road ABS function is enabled, the
Retarder Disable output is turned off. That
is, the engine retarders are left to function
without ABS intervention. For additional
information, see the Off-Road ABS
pamphlet in your vehicle’s glove box.
Effectiveness and Limitations
ESC is designed and optimized for trucks
and for tractors that tow single trailers. If a
tractor equipped with ESC is used to power
multiple trailer combinations (known as
"doubles" or "triples") the effectiveness of
the ESC system may be greatly reduced.
WARNING
Exercise extreme care when towing
doubles or triples with a vehicle equip-
ped with Electronic Stability Program.
Excessive speed and aggressive ma-
neuvers, such as sharp turns, sudden
steering inputs or abrupt lane changes
should be avoided because these ma-
neuvers could cause loss of vehicle
control possibly resulting in an acci-
dent involving death or personal injury.
Additionally, the ESC stability system’s
effectiveness may be greatly reduced if:
• The load shifts due to improper
retention, accident damage or the
inherently mobile nature of some
loads (for example, hanging meat,
live animals or partially laden
tankers).
• The vehicle has an unusually high
or offset center of gravity (CG).
• One side of the vehicle drops off
the pavement at an angle that is
too large to be counteracted by a
reduction in speed.
• The vehicle is used to haul double
or triple trailer combinations.
• If very rapidly winding steering
inputs are inputted at high speeds.
• There are mechanical problems
with suspension leveling of the
tractor or trailer resulting in uneven
loads.
• The vehicle is maneuvering on a
high banked road creating either
additional side forces due to the
weight (mass) of the vehicle or a
deviation between expected and
actual yaw rates.
• Gusty winds are strong enough to
cause significant side forces on the
vehicle and any towed vehicles.
To maximize the effectiveness of ESC:
• Loads must be properly secured
and evenly distributed at all times.
• Drivers need to exercise extreme
caution at all times, and avoid
sharp turns, sudden steering inputs
or abrupt lane changes at high
speeds, particularly if:
• The vehicle hauls loads that
could shift
• The vehicle or load has a high
or offset center of gravity (CG)
when loaded
• The vehicle tows doubles or
triples
DRIVING - Brakes
166 Y53-6126-1A1 (01/21)
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