BW8207 Bendix Global Scalable Brake Control (GSBC) System Operator’s Manual 10
BENDIX GSBC DISPLAY & BEHAVIOR AT STARTUP
When the Bendix® GSBC® system is rst powered on at vehicle ignition, the brake
control system does not require input or actions from the driver. For experienced
drivers, there are a few things that are dierent relative to previous Bendix® brake
control products:
POWER ON SELF TEST POST SEQUENCE/CHUFF TEST
When GSBC is rst powered on with the ignition key, the system will conduct a Power
On Self Test (POST). This is a brief self-check that the system performs to check for
basic operation of the system, components, internal software and communications
functions.
NOTE: For experienced drivers familiar with the Bendix “Chu” test, this POST test
performs a similar function, but it will not make an audible noise. This means that
the Chu test sound of solenoids clicking during key on will not be present. The
lack of clicking sound(s) during key on does not indicate a problem with the brake
control system or its operation.
FOOT BRAKE MODULE FBM WAKEUP
While powered, the GSBC system is always ready for the driver to press the foot brake
to request the service brakes. This FBM function allows the driver to step on the
service brake pedal while the vehicle is otherwise o, and still deliver the requested
service brake pressure to the foundation brakes. This activity does not require the
key to be in the ignition or the vehicle to be running – only that power has not been
cut using a battery disconnect switch or similar device.
NOTE: If there is no air in the service reservoirs, the brake pedal activation will result
in solenoids clicking, but no air being delivered to the foundation brakes.
SOLENOID CONTROL
When in Electronic Primary Mode, the GSBC system will use solenoids to apply
and release service brake pressure at the vehicle’s foundation brakes. If the system
encounters a fault significant enough to prevent the electronic system from
operating, (see the Pneumatic Backup Mode reference on page 9) these solenoids will
not activate and there will not be an audible clicking sound. Depending on how loud
the environment surrounding the vehicle is when this occurs (engine noise, other
vehicles, ambient noises, radio, etc.), the clicking may or may not be apparent to the
driver in the cab. This solenoid noise is normal and indicative of the brake control
system operating as intended. Once air pressure is restored to the reservoirs, the
brake control system will once again deliver air to the foundation brakes as normal.
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