Bendix Commercial Vehicle Systems eTrac Automated Air Pressure Transfer System - Manual

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Bendix ® eTrac ™ Automated Air Pressure Transfer System
1. INTRODUCTION
The Bendix ® eTrac ™ automated air pressure transfer
system is used on 6 x 2 semi-tractors that feature Bendix ®
premium and advanced Antilock Brake Systems (ABS).
This system complements the Bendix ® Smart ATC ™
( Automatic Traction Control) feature of our ABS system to
provide improved traction at low speeds (e.g. pulling away
on an inclined ramp, or in slippery conditions such as mud
or snow-covered surfaces, etc.)
SD-13-21021
FIGURE 1 - BENDIX ® eTrac ™ SYSTEM WITH SYSTEM COMPONENTS AND A SIMPLE LEVELING SYSTEM SCHEMATIC
Steer axle
Drive axle Tag axle
When needed, the
system provides
the ability to add air
pressure to the drive
axle suspension air
bags, and remove
air pressure from the
tag axle suspension
air bags
See below for labeled
component descriptions
Tag axle
suspension
air bags
(2)
Wheel speed sensors
(All wheel-ends)
Drive axle
suspension
air bags
(2)
2
3
4
5
6
Bendix ® DC-4 ®
double-check
valve
Bendix ® FCS-9700 ™
solenoid valve
Bendix ® R-12 ®
relay valve
Bendix ® brand ABS controller
(Premium or Advanced EC-60 designation or later)
Two Bendix ® RV-3 ™
valves
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2
3
4
5
6
Leveling
valve
When active, the Bendix eTrac system vents — or
“dumps” — the air pressure of the tag axle suspension
air bags, and increases the air pressure in the drive axle
suspension air bags to a pre-determined maximum. This
action helps the drive axle to gain more traction.
The air pressure is distributed equally to the
drive and tag axle suspension air bags
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Simple 6x2
Air Suspension
Leveling
Control System
Leveling
valve
Bendix ®
brand ABS
controller
(Premium or
Advanced)
1
Air supply