322 OPERATION
ANTI-LOCK BRAKING SYSTEM (ABS)
The vehicle has a standard brake system, equipped with an electronic speed monitoring and
control system, Anti-lock Braking System (ABS). ABS monitors wheel speed continuously
but is not involved in controlling the wheel speed unless there is an emergency. In normal
braking applications, the standard air brake system is in effect.
WARNING
For proper ABS operation, DO NOT
change tire sizes. The size of the
tires installed during production are
programmed into the electronic control
unit. Installing different sized tires could
result in a reduced brake force, leading to
longer stopping distances or accidents.
There is a sensor installed in each wheel on a monitored axle. The sensors transmit
information to the electronic control unit (ECU). The ECU interprets the signals and
calculates wheel speed, wheel retarding and a vehicle reference speed. If the calculations
indicate a wheel lock-up situation, a signal is sent from the ECU to the appropriate ABS
modulator valve to reduce braking pressure. During emergency braking, the modulator valve
alternately reduces, increases or maintains air pressure in the brake chamber to prevent
wheel lock-up.
During emergency or reduced-traction stops, fully depress the foot brake pedal until the
vehicle comes to a safe stop. DO NOT PUMP the brake pedal. With the brake pedal fully
depressed, the ABS will control all wheels to provide steering control and a reduced braking
distance.
Although the ABS improves vehicle control during emergency braking situations, the
operator still has the responsibility to change driving styles depending on the existing traffic,
road and/or weather conditions. For example, the ABS cannot prevent an accident if the
driver is speeding or following too closely on slippery surfaces.
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