Operation
WARNING
To prevent property damage, personal injury,
and / or death, if the Antilock Brake System
(ABS) warning indicator comes on, have the ABS
repaired immediately as stopping distances may
increase under certain braking conditions. Take
every precaution to prevent wheel lockup, which
could result in loss of vehicle control.
CAUTION
To prevent damage to the electrical system
or ABS components,
when welding on an
ABS-equipped vehicle disconnect the power
connector from the Electronic Control Unit (ECU).
The ABS system is a mandated system used with the Hydraulic
and Air Brake systems. The antilock brake system electronically
monitors vehicle wheel speed, and only engages when wheel
lock is imminent. The standard brake system controls normal
braking when the ABS is not engaged.
ABS requires few
changes in driving practices. For the best stopping performance,
press, do not pump the brake pedal until the vehicle slows
to desired speed or stops. The ABS system cannot provide
any better braking and steering capability than the available
road traction permits. If the road is slippery, it takes longer to
stop than on a dry road. Steering maneuverability is similarly
limited. Vehicle speed must be reduced to compensate for the
extended time and distance required to stop or slow the vehicle
on slippery roads. ABS prevents lockup of controlled wheels if
you over brake for existing road conditions.
The wheel hubs carry exciter rings used by the axle mounted
sensors to transmit wheel speed information to the ABS
electronic control unit located on the chassis frame. The control
unit monitors and compares all wheel speed inputs to determine
if any wheel(s) are about to lock. If wheel lockup is about to
occur, the control unit commands the appropriate modulator
valve to adjust pressure delivery to prevent wheel lockup.
If over-braking causes wheel lockup on the rear drive axles while
retarding devices are in operation, the ABS will interrupt and
disable the retarder until the lockup situation has stopped.
The ABS is equipped with a warning indicator located in the
vehicle's Instrument Panel Gauge Cluster. Each time the ignition
is turned on the ABS performs a self check. The ABS warning
indicator will illuminate and if the ABS passes the self check, the
indicator will turn off a few seconds after the ignition is turned on.
ABS fault codes will be electronically stored in the ABS.
Antilock Driving Tips
•
Use controlled, even pressure to stop the vehicle, being
careful not to skid. Most effective stopping will be achieved
in this situation.
•
If the vehicle begins to skid, maintain even pressure on the
brake pedal. The ABS controller will rapidly cycle the brakes
on the skidding wheel(s), while maintaining even pressure
on the non-skidding wheels.
•
While maintaining even pressure on the brake pedal, steer
around any hazardous objects in your path.
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Summary of Contents for BE Series
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