1
®
SD-13-4757
GEN 4
™
AND GEN 5
™
ABS INTRODUCTION
This manual describes the Bendix
®
A-18
™
trailer ABS
system and contains two primary sections:
•
Installation
•
Service
The Installation section provides the information required
for the proper installation of a FMVSS-121 compliant trailer
air brake systems that incorporate the Bendix Trailer ABS
system and complementary trailer components.
The Service section of the manual includes the information
necessary to properly maintain, troubleshoot and repair the
A-18
™
trailer ABS system.
Following the installation, service, and troubleshooting
procedures contained in this manual will produce a high
performance, long life, low maintenance antilock braking
system.
For assistance in your area call Bendix at 1-800-247-2725
or RoadRanger
®
at 1-800-826-4357.
Benefits of Trailer ABS
ABS-controlled trailer braking ensures optimum vehicle
stability while minimizing the stopping distance. During
vehicle operation, the trailer ABS Electronic Control Unit
(ECU) continuously monitors all wheel speed sensors. Data
input from the wheel speed sensors allows the ECU to:
•
Detect impending wheel lock.
•
Maintain optimum wheel slip.
•
Maximize overall braking effectiveness.
•
Minimize tendencies for trailer swing out during hard
braking conditions.
Document Revision Level
This document is subject to revision.
For updates please visit www.bendix.com.
Bendix
®
A-18
™
Trailer ABS (Gen 4
™
and Gen 5
™
ABS)
FIGURE 1 - ABS Controller Assemblies
Table of Contents
Power Requirements for ABS . . . . . . . . . . . . . . . . . . . 3
General Air Brake Requirements . . . . . . . . . . . . . . . . . 4
Brake Priority Options . . . . . . . . . . . . . . . . . . . . . . . . . 5
ABS Performance Characteristics . . . . . . . . . . . . . . . . 6
ABS Controlled Braking . . . . . . . . . . . . . . . . . . . . . . . . 6
ABS Component Function . . . . . . . . . . . . . . . . . . . . . . 6
Trailer ABS Configurations . . . . . . . . . . . . . . . . . . . . . 7
Sensor Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Trailer ABS Component Overview . . . . . . . . . . . . . . . . 9
Electronic Control Unit (ECU) . . . . . . . . . . . . . . . . . . 11
Relay Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Relay Valve Operation Modes . . . . . . . . . . . . . . . . . . 14
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Install the ECU/Relay Valve and
Stand Alone Relay Valve . . . . . . . . . . . . . . . . . . . . . 16
Install the Inline Power Connector . . . . . . . . . . . . . . . 17
Install the Main ABS Harness . . . . . . . . . . . . . . . . . . 17
Install the Trailer Mounted Warning Light . . . . . . . . . 18
End-Of-Line Diagnostics . . . . . . . . . . . . . . . . . . . . . . 23
Use of Hand Held Tool for Configuration . . . . . . . . . . 23
Troubleshooting and Fault Codes . . . . . . . . . . . . . . . 25
Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
ServiceRanger PC Software . . . . . . . . . . . . . . . . . . . 27
ABS Valve Troubleshooting . . . . . . . . . . . . . . . . . . . . 28
Speed Sensor Troubleshooting . . . . . . . . . . . . . . . . . 29
Accessing Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Fault Code Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Bendix
®
is a registered trademark of Bendix Commercial
Vehicle Systems LLC.
Eaton
®
, RoadRanger
®
, and ServiceRanger
®
are registered
trademarks of Eaton Corporation.
