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Shalom Jacobs
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Moose - 3/30/2013 7:44:58 AM
   
Lift axle & ABS law
can anyone {Terry}? find the regulations about the ABS sensor on lift axle ?
please?
my trailer have a spread axle. the front one is a lift axle.
its have 4 ABS units.
once the axle is up, the trailer ABS light will comes on.
so we disconnected the L/A units.
but they comes out of the axle, so the only way to disconnect, is to leave them hanging out there.
which is every DOT inspector dream.
the ABS computer now think the trailer have only one axle.
which makes the whole unit worthless, yet i have to have it on because of the mandate.
talking with the EOM,{East, Handrickson}, they do not have a software designed for an lift axle sensor that will detect when the axle is up, and reconfigure the computer to match it.
so my question is: since it is only a matter of time till an DOT inspector will challenge the ABS configuration, what dose DOT's green book have to say ?.

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Bob Caffee - 3/30/2013 7:30:22 PM
   
RE:Lift axle & ABS law
Moose,
I think I would find out if a solenoid or relay could be installed in the sensor cable that would disable the sensors on the lift axle when the axle is up. I am assuming the axle is lifted with an air/electric valve, one could tap the power line in that circuit to activate the solenoid/relay. That would do the same as unhooking them as you are doing now. Hope this will work for your problem, good luck, Bob.

Shalom Jacobs
25k
25k
Moose - 3/30/2013 9:30:57 PM
   
RE:Lift axle & ABS law
Thanks.
Bob - i have discussed this problem with Handrickson's, the higher up's engineers. they explained to me that the ABS system is provided by an outside EOM. and admitted that it is in use with other outfits under different names.
basically telling me that this is the only provided for an entire industry.
yet i am the first one to contact them and complained.
are they for real ?
i was on the phone with the top Handrickson salesman AND the company engineer, and they told me that no one ever had this problem !
this is in fact an out of service violation - yet i am the only one that ever notice that ?
the engineer told me that they are currently (a year ago) are not working on a solution.
this is way over my head to solve. and i do not think a truck technician can solve this.can you {or anyone} provide contact to a Company that might be able to solve this problem and install such electrical system ?

Terry OConnell
25k
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Terry - 3/30/2013 8:25:46 PM
   
RE:Lift axle & ABS law
Moose:
Bob gave you the mechanical advice, so Ill address your comments about the regulations. 393.48(c)(6) says, in effect, that the brakes on a lift axle in the raised position do not have to be functional. Of course, when the axle is down and the wheels are on the ground, the brakes must be functional. Now go to 393.55(d). This section says that all air brake equipped vehicles, such as yours, must be equipped with an electrical circuit that is capable of transmitting a malfunction signal from the ABS on the towed vehicles to the tractor cab. Now, since the lift axle brakes are not required to be functional when raised, the signal would not apply.

Consider this. when a converter dolly is in use, most often with towed doubles, the brakes would have to be a part of the ABS, So the software you discuss would have to differentiate when an extra set of brakes were in use or not, similar to the lift axle
After a 30 year U.S. Coast Guard career, Terry and his wife René, obtained their CDLs and began a 19 year adventure in expediting. In 2008, he entered his third career working for the Safety Department of an interstate carrier.

Shalom Jacobs
25k
25k
Moose - 3/30/2013 9:41:35 PM
   
RE:Lift axle & ABS law
Terry .
are you saying that i am in Violation when the axle is down ?
-can't be !
{right now the lift axle units are permanently disconnected.)
as of Handrickson, there is NO software that can handle a Lift axle.
howcome i am the only trucker out there with a Lift axle ?
what are all the other truckers do ?
you'd think CVSA will be all over this!
Bob , for example, dose yours Lift axle have ABS units ?, if so, how dose it work in your truck?

Terry OConnell
25k
25k
Terry - 3/31/2013 9:33:57 AM
   
RE:Lift axle & ABS law
Moose.
During my feeble attempt to answer your question by applying logic to a review of the content of the FMCSA regulations contained in §393, I suggested that all of the brakes on your semitrailer be monitored by the ABS malfunction signal.

I should have additionally gone to the Safety Standards in the FMVSS 571.121, which states.in S5.2.3.1(a) "Each semitrailer (including a trailer converter dolly) manufactured on or after March 1, 1998, shall be equipped with an antilock brake system that directly controls the wheels of at least one axle of the vehicle. Wheels on other axles of the vehicle may be indirectly controlled by the antilock brake system."

So, FMCSA says you must have an antilock brake system on your semitrailer that was built after March 1, 1998. Some, including me, would interpret this to mean all of the brakes on your trailer must have antilock functionality. However, to confuse the matter, the safety standards that the regulation references, says at least ONE AXLE must be controlled. You could infer that, in your case, your fixed axle is ABS and, therefore, your lift axle does not need to be controlled by the ABS. The section gives you the OPTION of indirectly controlling the lift axle within the antilock brake system.
After a 30 year U.S. Coast Guard career, Terry and his wife René, obtained their CDLs and began a 19 year adventure in expediting. In 2008, he entered his third career working for the Safety Department of an interstate carrier.

Terry OConnell
25k
25k
Terry - 3/31/2013 11:19:33 AM
   
RE:Lift axle & ABS law
Moose:
in your post above, you said, "this is in fact an out of service violation - yet i am the only one that ever notice that ?"

I have just completed a review of the North American Standard Out-of-Service Criteria dated April 1, 2013. I can find no reference in the standards that discuss an out-of-service criteria for the antilock brake system. You could reasonably expect to get a citation for a defective ABS, including the malfunction warning indicators, but not be placed OOS. Such a citation could subject you to 4 CSA severity weight points if issued during a roadside inspection.

,
After a 30 year U.S. Coast Guard career, Terry and his wife René, obtained their CDLs and began a 19 year adventure in expediting. In 2008, he entered his third career working for the Safety Department of an interstate carrier.

Linda Caffee
200k
200k
Linda.caffee - 3/31/2013 7:40:31 PM
   
RE:Lift axle & ABS law
Moose we do not have ABS on our liftable pusher axle.

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Barrettville - 8/6/2017 6:45:33 AM
   
RE:Lift axle & ABS law
Take and switch the rear axle speed sensors to the front axle spots on the abs ecm. This will prevent any unwanted abs codes and the system will still work as intended

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