BENDIX GSBC - Components

BW8207 Bendix Global Scalable Brake Control (GSBC) System Operator’s Manual 8
PRETRIP INSPECTION INFORMATION
The Bendix® GSBC® system is an Electronic Braking System (EBS) which diers from
previous generation Bendix brake systems. This results in some changes to your
pre-trip inspection process:
Indicator Lamps: There is an additional lamp on the dashboard as compared to
previous systems. This red “BRAKE” lamp should briey illuminate (for approximately
3 seconds) when the vehicle is rst powered on, but the lamp should not stay
illuminated. If this lamp stays illuminated, it indicates a fault with the system or
function described by the lamp. For more information about this, or, for more
instructions on what to do if the lamp stays illuminated on the dashboard, refer to
the Display Indicators section on page 14.
Change in Components: GSBC is comprised of fewer components than previous
systems. As a result, valves that an experienced driver may be accustomed to seeing
during pre-trip inspections will not be present on the vehicle.
When conducting a pre-trip inspection, use the following table to help locate the
main components of a GSBC Service Braking System.
Main Components Generic Locations
Name Location Function
FBM (Foot Brake
Module)
Firewall, connected to the
brake pedal
Turns foot motion into electronic
request for service braking
1-Channel EPM
(Electro-Pneumatic
Module)
Above left frame rail in front
of the cab, under hood;
occasionally on accessory
axles, like lift axles
Smart relay valve to control service
pressure on the steer axle or lift axle
Modulators
Frame rail inside left and right
steer wheels
Provide steer wheel specic
modulation of air pressure to prevent
wheel lockup and provide vehicle
stability
2-Channel EPM
(Electro-Pneumatic
Module)
Frame rail or crossmember
close to the controlled axle(s)
Smart relay valve to control service
pressure on the steer axle(s)
Note: Vehicles may have between one
and three 2-Channel EPMs, depending
on the axle conguration and layout
eTPCM (Electronic
Trailer Pressure Control
Module)
Back of cab, close to the
trailer air lines
Smart relay valve to electronically
control pressure to the trailer
Electronic Control Unit
(ECU)
Rigidly mounted to the
exterior of the vehicle;
typically under the cab on the
framerail
Controls the entire GSBC system and
provides an interface between the
vehicle and the braking system