I have never had 3 ABS lights 
Wheel Nut:
I have never had 3 ABS lights
One of them is an abs light, it tells you that youād benefit from doing some sit-ups. It usually comes on when the driver gets in and their gut touches the bottom of the steering wheel.
ABS faults seem very common at this time of year, Iāve always assumed that this is something to do with road gritting, the muck thrown up interfering with sensors because these faults often seem to clear after driving on wet un-gritted roads.
Harry Monk:
ABS faults seem very common at this time of year, Iāve always assumed that this is something to do with road gritting, the muck thrown up interfering with sensors because these faults often seem to clear after driving on wet un-gritted roads.
Even wet roads can cause a fault, the exciter ring gets oxidisation (rust) on it and the sensor cannot read it properly.
Own Account Driver:
Saaamon:
Are you lot saying you never drive a truck with an amber trailer abs light on or an ebs fault etc? Not being funny in anyway, the reason i ask is because ive never battered an eye lid at it simply because the people iāve worked for have just told me to get on with it.Amber yes, red no. Remember the Jedi mind tricks if youāre pulled by VOSA āthis light wasnāt on when I left the yardā - or just switch the ignition off before they see it.
Increasingly these days if itās a dynamic fault it is the case that the exciter rings do need the rust cleaning off, the sensor needs knocking closer to them or even the wheel bearings on the way out. Itās less commom now that the unit is using a yellow ABS lamp to tell you the trailer isnāt EBS for example.
If itās locking severely up all the time when light or empty might be a load sensing valve issue or some other reason but itās a symptom of the trailer sending full tank pressure to the chambers.
The OPs scenario doesnāt sound like a normal dynamic fault ie sensor or exciter rings where the light goes once you travel over 10kmh then comes on again later when you go over a certain speed or when you next brake.
Load sensing valve on a trailer is called an air bag,the higher the load imposed causes a higher pressure to be pushed into the bags to maintain ride height which then controls pressure applied to the brake chamber membranes.Heavier trailer more brake pressure.No vehicle with air suspension uses a LSV anymore.
Way to check ABS is (on older trailers 10 years or so) leave out S susie lead and press brakes.Should get double āspitā as ABS module tests dump solenoid coils.Older trailers have power feed from brake lights as well as S susie.(you must have yellow line connected to feed air to ABS module)No need for green bulkhead lamp to illuminate/flash if you have ABS monitored on the truck dash board.
Newer 2nd generation have ISO lead.Leave ignition on and plug in ISO lead should get double spit again as ABS ecu powers up.No spit then is either no power to abs or sensing link fail or ABS ecu goosed.Check for 3 power feeds to ISO lead from tractor.
3rd generation ABS completes full self check on power up including wheel sensor itegrity.This type do not need the 7 mph calibration trigger like the older units.
You should hear the module run through the self test by triggering all its dump and lock solenoids and valves.
Older type have a door in the module with a digital screen which displays a numerical fault code newer types have a trailer info module which will bring up most(not all)fault info and can be used to check sensor read out by jacking up the axle and spinning the wheels.ABS will go into default if a fault occurs and ordinary braking takes over.
Had a trailer come in the other day with strange ABS fault.Somebody had fitted a new hub to the sensed axle but not checked the reluctor rings.The old hub had 80 slots in the ring but the new hub had 60.After a few miles up came the lamp with the fault info āimprobable signal sensor leftā
Own Account Driver:
Saaamon:
Are you lot saying you never drive a truck with an amber trailer abs light on or an ebs fault etc? Not being funny in anyway, the reason i ask is because ive never battered an eye lid at it simply because the people iāve worked for have just told me to get on with it.Amber yes, red no.
Cheers
Bking:
Own Account Driver:
Saaamon:
Are you lot saying you never drive a truck with an amber trailer abs light on or an ebs fault etc? Not being funny in anyway, the reason i ask is because ive never battered an eye lid at it simply because the people iāve worked for have just told me to get on with it.Amber yes, red no. Remember the Jedi mind tricks if youāre pulled by VOSA āthis light wasnāt on when I left the yardā - or just switch the ignition off before they see it.
Increasingly these days if itās a dynamic fault it is the case that the exciter rings do need the rust cleaning off, the sensor needs knocking closer to them or even the wheel bearings on the way out. Itās less commom now that the unit is using a yellow ABS lamp to tell you the trailer isnāt EBS for example.
If itās locking severely up all the time when light or empty might be a load sensing valve issue or some other reason but itās a symptom of the trailer sending full tank pressure to the chambers.
The OPs scenario doesnāt sound like a normal dynamic fault ie sensor or exciter rings where the light goes once you travel over 10kmh then comes on again later when you go over a certain speed or when you next brake.
Load sensing valve on a trailer is called an air bag,the higher the load imposed causes a higher pressure to be pushed into the bags to maintain ride height which then controls pressure applied to the brake chamber membranes.Heavier trailer more brake pressure.No vehicle with air suspension uses a LSV anymore.
Using a ā¦
Only a 2/10 from me Iām afraid. Would have been a 4/10 if you said 1 red light. One of the most obvious trolling posts so far this year, although it is only February so thereās still hope for you yet 
ā¦Using a tapping from the airbag ring feed (usualy from the ride height control valve but not always) into the modulator block to sense bag pressure.On later systems this can also be used to get information on % axle loading and roll stability programme control.
Bking:
ā¦Using a tapping from the airbag ring feed (usualy from the ride height control valve but not always) into the modulator block to sense bag pressure.On later systems this can also be used to get information on % axle loading and roll stability programme control.
And on one of the many, many pre-EBS trailers on the roads where would this feed from the airbags go instead of the EBS modulator block?
What the hell has EBS got to do with ABS?
ABS is a fully isolated stand alone system.EBS is a fancy name for a Data transfer system between the tractor and the trailer.EBS can apply the brakes via a canbus digital link(the brown/white,green/white) used in the ISO lead but it has no effect on the ABS ECU as all its parameters are stored within the ABS module itself.
EBS may apply the brakes but once a heavy wheel deceleration is sensed the ABS takes over and opens the dump solenoids no matter what the EBS signal is telling it to do.
strongbowpeter:
āā¦a trailer thats showing no abs and 3 red warning lights on the dashā¦?ā
The clue could be āā¦on the dashā¦ā if itās not from physical shenanigans of the trailer.
I had ABS disco-lights on a 55 plated, shed of a DAF CF yesterday - and it was a knacked Fuse #7
Bking:
What the hell has EBS got to do with ABS?ABS is a fully isolated stand alone system.EBS is a fancy name for a Data transfer system between the tractor and the trailer.EBS can apply the brakes via a canbus digital link(the brown/white,green/white) used in the ISO lead but it has no effect on the ABS ECU as all its parameters are stored within the ABS module itself.
EBS may apply the brakes but once a heavy wheel deceleration is sensed the ABS takes over and opens the dump solenoids no matter what the EBS signal is telling it to do.
Not sure what this waffle is about. So again on a trailer that pre-dates having an EBS system* into which component does the aforementioned air feed from the air suspension bags go?
*A clue if it hasnāt got EBS it wonāt have an EBS modulator block so the feed will not go into there - so no more unrelated cut&paste about allsorts of random EBS functions.
What the hell(again) is an āEBS modulatorā never mind an āEBS modulator blockā
EBS is an ecu controlled communication system.
The feed from the bags feed into the ABS modulator block.The pressure sensed by the ABS module thenā¦ Ahh forget it!
Bking:
What the hell(again) is an āEBS modulatorā never mind an āEBS modulator blockāEBS is an ecu controlled communication system.
The feed from the bags feed into the ABS modulator block.The pressure sensed by the ABS module thenā¦ Ahh forget it!
No ISO or canbus in that postā¦I thought that was your favourite bit of jargon?
You mentioned it because I rather foolishly assumed you were referring to the feed going into the trailer modulator unit on an EBS trailer which would have been correct. A modulator on a trailer with EBS will sense the pressure from the suspension air bags but has the advantage of being able to do so electronically where previously a separate mechanical load sensing valve would have been required in the circuit ahead of the ABS modulator valve .
So Iām afraid the suggestion, you so confidently made, that suspension air bags have replaced load sensing valves is complete and utter crap as is the idea that nothing with air suspension has a load sensing valve. Even if the feed on a non-EBS trailer appeared to go into the ABS modulator then in reality it would only mean a mechanical load sensing valve had been incorporated into the design.
EBS is an awful lot more than some electronic way of the unit talking to the trailer as you dismiss it as. It means instead of relays being operated by air signals everything is being done fly by wire and allows on the newest versions the combination of all the previous mechanical pneumatic parts on a trailer ABS system to be combined into one electronically controlled valve.
Iām not sure youāve been under many, if any, trailers with a spanner but if you do ever find yourself under one of the many older pre-EBS trailers around hereās a picture of what youāre looking for. Itās a common type of load sensing valve (designs may vary) still available from many parts suppliers that perhaps, who knows, are too stupid to realise āa suspension airbag is a load sensing valveā .
Ever been under trailers No never(only 5 nights a week) but I have a very well informed friend that tells me i talk an absolute load of ā ā ā ā ā ā ā ā .
because I know absolutely ā ā ā ā all bout the the trucks I repair.Even after 35 years some driver can diagnose the āproblemā for me
Maybe thats something you should take up with your union.
Stop being some smart arse ā ā ā ā and leave it to to the people who know what the hell they are doing
thankyou
I know what I do so dont feed me amatuer crap.
Great another fantasist
I just love setting these ones up without internet access on site!
Own Account Driver:
Great another fantasist
Stick to driving them my man the technical side is a bit beyond you.
Have a nice day baby!