BW2266 ©2011 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group 7/11 • All Rights Reserved • Printed in U.S.A.
Introduction to
Understanding Bendix
®
Anti-lock Braking Systems
(ABS)
for Air Braked Vehicles
This booklet is an introduction to ABS for vehicles with standard ABS features.
For vehicles with Bendix advanced ABS features such as
ESP
®
stability systems, see booklet BW2489
Sources of Additional Information about
your Bendix
®
ABS System
Consult the vehicle manufacturer’s documentation.
Visit www.bendix.com for free downloads of
Service Data sheets, or go to
the Literature Center at bendix.com.
Contact the Bendix Tech Team at
1-800-AIR-BRAKE (1-800-247-2725)
Representatives are available
Mon. - Fri. 8:00 a.m. to 6:00 p.m. EST.
Mode
ABS
Lamp
ATC
Lamp
Trailer
ABS
Lamp
At Vehicle Startup
Ignition on - start
up (trailer with
PLC)
On for 3
seconds*
On for
2.5
seconds*
On for 3
seconds*
*If any of the
described lamp
behaviors do not
occur — or if the
lamp remains on
during operation
— have the
vehicle serviced
by a qualied
mechanic as soon
as possible to
restore full system
functionality.
3 seconds after
ignition (with no
Diagnostic Trouble
Codes)
Lamp
Off*
Lamp
Off*
Lamp
Off*
Special Mode Operation
During an
Automatic Traction
Control (ATC)
Event
Lamp
Off
Lamp
ashes
quickly
• Reduces wheel slip during
acceleration at low speeds
ABS
Off-Road
Mode
Normal
Lamp
ashes
slowly
Lamp Off
• Uses dash switch
• Not for rm road surfaces
• Allows more wheel lock-up
(less ABS intervention)
• Mode only applies under
25 mph (Over 25 mph, the
system reverts to full ABS,
and ATC lamp goes off)
During
an ATC
Event
Lamp
ashes
quickly
ATC
Deep
Mud/
Snow/
Mode
Normal
Lamp
Off
Lamp
ashes
slowly
• Uses dash switch
• Increases allowable wheel
slip during ATC interventions
• Not for rm road surfaces
During
an ATC
Event
Lamp
ashes
quickly
Traction Control Override Lamp On
• Uses dash switch
• ATC system switched off
65
ABS and ATC
Indicator Lamps
Chart
• Brake-light-only powered ABS: Each time the brakes are applied the warning
lamp will come on for approximately 3 seconds and then turn off. If the lamp
remains on during braking, ABS may not be operating. The vehicle will
retain normal service braking, although without the benets of ABS. Have
the trailer serviced as soon as possible to restore ABS operation.
ATC Indicator Lamp
If your vehicle is also equipped with the optional Automatic Traction Control
(ATC) system, a third indicator lamp will be installed on the dash. (The same
lamp is also used to indicate the ATC “Mud/Snow” mode, see below.)
• During the bulb check at vehicle ignition your ATC indicator lamp will
illuminate for approximately two and a half seconds and then turn off. If the
ATC indicator lamp does not illuminate at ignition, or if it remains on steadily
(not ashing) after ignition, or if it illuminates steadily (not ashing) while
you are driving (except in off-road mode), the ATC system may not be fully
functional or its operation may be completely disabled. If this happens,
your vehicle will still have normal service braking and it still can be driven,
although without the benets of ATC. Have the vehicle serviced by a qualied
mechanic as soon as possible to restore full ATC functionality.
• The ATC indicator lamp also ashes continually (at different rates) to show
that either: the off-road mode is being used, or during an ATC intervention
event.
