I would just run it up to 10kmh then lock up on some slick looking tarmac, with the window down, and see if it’s cycling.
Headboard green lamps, if even fitted and visible from the mirror are many and varied. In general should light and go out when braking if stays on then faulty.
“modern” ABS units dont need to run up to 10km as they do a stationary self test.
They pulse each wheel sensor and check resistance.As vehicle moves it checks for exciter ring pulse and “probability” count.
eg both wheels are rotating within its parameters.
scanny77:
all of the companies i will work for will not allow a vehicle to leave the depot with that light on but i only work for highly compliant companies. their company policies may be stricter than the law though
No’ strictly speaking they are correct. The journey shouldn’t be embarked on unless it can be established without doubt it is a compatability issue and the trailer ABS is functioning.
scanny77:
all of the companies i will work for will not allow a vehicle to leave the depot with that light on but i only work for highly compliant companies. their company policies may be stricter than the law though
No’ strictly speaking they are correct. The journey shouldn’t be embarked on unless it can be established without doubt it is a compatability issue and the trailer ABS is functioning.
thanks for the clarification on that. i did suspect that but wasnt 100% sure if it was law or not
I would just run it up to 10kmh then lock up on some slick looking tarmac, with the window down, and see if it’s cycling.
Headboard green lamps, if even fitted and visible from the mirror are many and varied. In general should light and go out when braking if stays on then faulty.
Headboard warning lamps are only fitted to ABS trailers, also they are an advice indicator and not a warning lamp. If not working it would attract an advisory on test or the roadside.
The important lamp is on the dashboard
Ok, assumed you were referring to headboard lights as dash lights fairly self-explanatory.
Wht makes you think we did? Jacknifes were a common occurence, I imagine if we had camera phones and social media in them days we’d have 30 page threads running about them.
I would just run it up to 10kmh then lock up on some slick looking tarmac, with the window down, and see if it’s cycling.
Headboard green lamps, if even fitted and visible from the mirror are many and varied. In general should light and go out when braking if stays on then faulty.
“modern” ABS units dont need to run up to 10km as they do a stationary self test.
They pulse each wheel sensor and check resistance.As vehicle moves it checks for exciter ring pulse and “probability” count.
eg both wheels are rotating within its parameters.
They still work the same it’s just the way information is displayed to the driver has altered in assuming the system functions unless dynamic information proves otherwise where as previously it was assumed not to be working until satisfactory dynamic results were obtained. Earlier versions, ie pre-EBS, still tested sensors and general system integrity.
2nd generation Range Rovers and other cars of the same era did the same thing with the ABS light only extinguishing with satisfactory dynamic results.
" If the lamp in coloured yellow/
amber the examiner will need to
obtain evidence from the vehicle
driver that the MIL became
illuminated during this journey"
Why you do daily walk round checks. On our run sheets we have one for each trailer swap as well. I had one come on tonight 2hrs into a run up to Lockerbie. Probably got filled with crap going over the 66 where it was snowing.
A DAF CF tractor I drove recently flashed the ABS light 6? Times (you could hear a solenoid clicking in the glove box) on starting the engine then went out. Something I’ve never encountered before. This happened several times during the day, but hasn’t happened with this unit before. Anyone know what the problem is?
Very strangely and most inconvenient for planners, transport managers and lazy fitters the official VoSA procedure for defecting ABS warning lights makes absolutely no mention of ‘compatibility issues’. They have heard this excuse ad nauseam ad infinitum. 10 to 15 years ago it was a common problem. It has also raised its head on occasions with the introduction of new models, which indicates a lack of thorough development testing by the manufacturer which should have eliminated the issue. If the light is on and will not extinguish when the vehicle travels then there is a fault. Unless there evidence as described in the link, which the driver can produce to prove that the defect occurred during the journey and appropriate action has been taken, then vosa will do what they are required to do. As has been mentioned, often the rectification required to extinguish the light is not particularly challenging or involved. However In the circumstances mentioned ie about to leave the yard on a journey, neither the manager or planner sitting behind a desk, nor the fleet engineer or fitter at the other end of a telephone, is qualified or able to declare the vehicle roadworthy. The only person able to do so being the fitter who has the vehicle in front of him. Even then the chances of him signing the vehicle off as roadworthy and accepting responsibility are not great.
Looks like another ongoing subject with no definitive answer. Ive regularly been say, 80 miles into a 135 mile drop when the amber abs dash light pops up to say hello. Ive pulled in , switched off, unplugged, re-plugged and set off again with the light no longer showing. 20 miles down the road and the bugger comes on again. Do the drop, set off and the light is off again. 20 miles down the road etc, etc. Defect note on return to depot. Couple of days later, same unit, same repetitive problem. What more can you do but report it to the workshops via the appropriate channels? I just drive the thing much more gently, and with as much forward planning as i can muster. Half the time, on older, tired units, i think the sensors are most probably malfunctioning, but still take a lot more care.
Surely if the record shows that you`ve followed procedures and reported the fault, the workshop personnel have a fair degree of culpability in the matter?
I think it is pretty clear cut from a legal point of view.
RED ABS light on and the vehicle must not be used at all and not even driven to a place of repair. If it comes on during the journey - stop and go no further, follow the company’s reporting system. If its on at the start of the shift - vehicle must not go out.
AMBER ABS light on at the beginning of the shift, the vehicle must not be put into service. i.e You wouldn’t take a vehicle out with a known brake fault. If the AMBER comes on during the current journey, stop, check the basics such as ABS lead, fuses etc, if not solved, make a written defect report with mileage, location, time, your name, vehicle reg and details of the fault and you can now carry on for the rest of that day. Obviously you wouldn’t take the vehicle out again until fixed.
EBS lights - do not use the vehicle at all.
We should all know an AMBER ABS light is telling us there is something wrong but the ABS will still function within design parameters - that’s what the AMBER light is for. A RED light is telling you there is a fault and the ABS WILL NOT WORK. With that knowledge we can maybe make an informed decision. Personally for an AMBER ABS light at the beginning of the shift I would ‘consider’ taking the vehicle out depending on circumstances and attitudes of those I report it to. If I did take it out I would ensure I had my written defect report. A RED ABS light - not going anywhere with me driving it.
There seems to be mention on some of the posts of “just a faulty sensor” so it’s OK to carry on. Lets be honest - a faulty ANYTHING in a brake system can’t be good!
[quote="shep532
There seems to be mention on some of the posts of “just a faulty sensor” so it’s OK to carry on. Lets be honest - a faulty ANYTHING in a brake system can’t be good![/quote]
I agree totally - poor wording on my part, mate - i guess what i was trying to say was more along the lines of a sensor giving a false indication, rather than highlighting any serious malfunctioning component. y`know, a spurious electrical message? (hope that makes sense )
■■■■■■■:
[quote="shep532
There seems to be mention on some of the posts of “just a faulty sensor” so it’s OK to carry on. Lets be honest - a faulty ANYTHING in a brake system can’t be good!
I agree totally - poor wording on my part, mate - i guess what i was trying to say was more along the lines of a sensor giving a false indication, rather than highlighting any serious malfunctioning component. y`know, a spurious electrical message? (hope that makes sense )
[/quote]
I know what you mean. I do meet a lot of drivers who do seem to think “Oh it’s just a faulty sensor - happens all the time” - mechanics as well. Frightens me!
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