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SECTION 3
3.1
AUTOMATIC SLACK ADJUSTERS (ASA)
The brakes were properly adjusted on your LUFKIN Trailer before delivery.
Automatic slack adjusters are required by law, effective on all trailers produced since December 1993.
Depending on the brand of slack adjuster used, the operating, and adjusting procedures may vary.
Procedures for adjusting slack adjusters may be found by clicking on the links below.
ArvinMeritor Automatic Slack Adjusters
Bendix Automatic Slack Adjusters
Gunite Automatic Slack Adjusters
Haldex Automatic Slack Adjusters
3.2
AIR SYSTEM MAINTENANCE
3.2.1
BRAKE AIR ACTUATION MAINTENANCE
The air system on your trailer is the system that actuates and releases the brakes on the trailer. It
also has a second separate function that controls the parking brake and emergency brake system.
It is important to maintain the system in good working order through preventive maintenance. This
system was checked with the latest test equipment at the factory for function and timing as
required by the Department of Transportation.
As the complexity of the air brake system has increased, so has the need for clean air. Many of the
later design valves contain small orifices and passages and thus, are more susceptible to
contaminants. The prevention of freeze-ups in the system is also equally important. The use of an
air dryer, filter, and alcohol evaporator is highly recommended.
The following items should be checked by properly trained personnel on a periodic basis and any
time brake problems occur.
3.2.1.1
The air system must be kept free of leaks. Check all connections while system is charged
with a minimum of 100 psi air pressure. Check seals on glad hands each time they are
coupled. Replace if leak occurs.
3.2.1.2
Anti-compounding two-way check valve on top of the spring brake valve can be checked
by charging the service line and emergency line, then disconnect each line—one at a
time—with the other charged. There should not be any bleed back from the open line. If
so, the anti-compounding valve is stuck or malfunctioning. There should not be any
continuous exhausting of air from the body vents or exhaust valve on the spring brake
valve.
LINK TO VENDOR FILE
LINK TO VENDOR FILE
LINK TO VENDOR FILE
LINK TO VENDOR FILE
