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The following precautions should be observed when working on or around air brake
systems and components.
1. Stop vehicle engine and block vehicle wheels. Depleting vehicle air system pressure
may cause the vehicle to roll. Keep clear of chamber push rods and slack adjusters; they
may automatically apply as system air pressure drops.
2. Deplete all air pressure from the system before disconnecting a hose, plug, or
component.
3. Do not look into air jets or direct them at anyone. Always wear safety glasses when
working with air pressure as contaminants may be expelled and cause bodily harm.
4. Always read and understand recommended procedures before disassembling any
component. Warning and caution notices should be followed as some components
contain powerful springs and injury can result if not properly disassembled.
THE BRAKE SYSTEM ON LUFKIN TRAILERS IS DESIGNED AND CONSTRUCTED TO MEET FMVSS 121
REQUIREMENTS. IN ADDITION, COMPONENTS ARE SELECTED THAT WILL PROMOTE BRAKE BALANCE
BETWEEN TRACTOR AND TRAILER. IF ANY BRAKE COMPONENT IS REPLACED, IT SHOULD BE
REPLACED WITH AN EXACT DUPLICATE PART. THIS INCLUDES, BUT IS NOT LIMITED TO, RELAY
VALVES, QUICK RELEASE VALVES, BRAKE LINING, SLACK ADJUSTERS (SAME LENGTH), AND BRAKE
CHAMBER SIZE.
3.3
ANTILOCK BRAKE SYSTEM (ABS)
It is required by law that all trailers manufactured after March 1, 1998, have ABS. Your trailer may be
equipped with any brand currently available. Please see vendor links below for reference to installation and
trouble-shooting, or contact your LUFKIN representative.
Meritor-Wabco ABS
Bendix ABS
Because the law requires a constant power circuit for ABS, your trailer may be equipped with two
connectors on the front of the trailer. This arrangement provides electrical circuits for auxiliary equipment
that would normally use the middle pin on the J560 connector (Blue Wire) which now is dedicated to ABS.
The second connector is an ISO 3731, which is polarized to prevent inadvertent connection with the J560
plug. The ISO 3731 series is an auxiliary plug for the operation of auxiliary equipment.
LINK TO VENDOR FILE
LINK TO VENDOR FILE
