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Wesley
Trade Member
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Posted: Tue Mar 16th, 2010 11:56 pm |
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jagnut wrote: Thanks for your replies on this subject.
Since posting the original question the ABS has continued to play up, and started activating when trying to park or stop completely- meaning the car never actually stops!. Felt pretty scary! So I've taken the bull by the horns and completely removed the system. Having renewed the wheel sensors ,the only bit left to replace was the electronic module, but getting a replacement one of those for a 27 year old car would have costs many £££s., so the car now has normal brakes.
I've also been to my MOT garage and they've checked my car model against their VOSA chart , which doesn't go back that far. They logged on to check the vehicle details and there is nothing listed about ABS for that model, or any ABS note specifically for my vehicle . After checking the testers manual they agreed that when it comes to test time , if the entire ABS has been removed , then it wouldn't be part of the test- it would be tested like any non-ABS car.
So for me, a satisfactory outcome in the end and I feel a lot happier driving the car knowing the brakes aren't going to have a mind of their own.
This Really is "Not" the Correct option chosen.
A Good Diagnostic Specialist would have diagnosed the fault within I Hour,
There Will be "Obvious" "Witness Marks" left on the vehicle after 27 years, Clearly Indicating that Their Factory Fitted Option Was Indeed fitted to Your Vehicle.
Last edited on Thu Mar 18th, 2010 10:43 pm by Wesley
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nicknak
Trade Member
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Posted: Tue Mar 16th, 2010 04:32 pm |
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Don't forget you need to take it somewhere else for the mot as your man knows it had abs fitted.
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jagnut
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Posted: Tue Mar 16th, 2010 09:38 am |
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Thanks for your replies on this subject.
Since posting the original question the ABS has continued to play up, and started activating when trying to park or stop completely- meaning the car never actually stops!. Felt pretty scary! So I've taken the bull by the horns and completely removed the system. Having renewed the wheel sensors ,the only bit left to replace was the electronic module, but getting a replacement one of those for a 27 year old car would have costs many £££s., so the car now has normal brakes.
I've also been to my MOT garage and they've checked my car model against their VOSA chart , which doesn't go back that far. They logged on to check the vehicle details and there is nothing listed about ABS for that model, or any ABS note specifically for my vehicle . After checking the testers manual they agreed that when it comes to test time , if the entire ABS has been removed , then it wouldn't be part of the test- it would be tested like any non-ABS car.
So for me, a satisfactory outcome in the end and I feel a lot happier driving the car knowing the brakes aren't going to have a mind of their own.
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Wesley
Trade Member
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Posted: Tue Mar 16th, 2010 12:13 am |
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Wesley wrote: Hi,
find yourself a local diagnostics specialist, who will be able to trace the source of your ABS fault and have it fixed properly.
Back to "Best Practice" Then?
ps; no tutu required.
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golf
Trade Member
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Posted: Mon Mar 15th, 2010 11:48 pm |
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well said tooner, however the rules are the rules.
If you have a No. plate light bulb not working you will fail. Even if you have 58 of them working & just 1 out.
you can have no windscreen no wipers & no washers & pass!!
thats the way it is im afraid
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KevG
Super Moderator
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Posted: Mon Mar 15th, 2010 09:13 pm |
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I know how/What ABS does Tooner however
we dont make the rules I'm afraid.
If the light stays on it fails!
Sorry
What car is it?
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tooner
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Posted: Mon Mar 15th, 2010 09:03 pm |
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KevG wrote:
Hi Tooner
An abs system will normally stop the car if it develops an electrical/pump fault.
However there may be pulsing etc if a sensor is down.
Kev
ABS systems are designed to shut down in the event of a fault and stay shut down until the control module runs its next system check (every time the ignition is switched on and off). This precautionary measure is put in place to prevent erratic sensory inputs to the module which may ultimately effect the direct driver control of the vehicles braking.
An ABS system fitted to a vehicle does not enhance the braking effort in anyway. It only allows you to Simultaneously steer and brake for increased driver control.
So in these following conditions:-
1. ABS warning light on
2. the vehicles braking system appears in perfect physical condition i.e no corrosion/leaks or damaged components
3. RBT or decelerometer test results prove the vehicles brakes are working efficiently
I do not understand why the rules are such that the vehicle would fail its MOT.
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KevG
Super Moderator
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Posted: Mon Mar 15th, 2010 08:47 pm |
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Just re-read your question.
Forgot to say the obvious.
If the ABS lamp indicates a fault(Testers have a list of correct ABS lamp sequences for every vehicle)
Its a fail.
Kev
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KevG
Super Moderator
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Posted: Mon Mar 15th, 2010 08:43 pm |
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Hi Tooner
An abs system will normally stop the car if it develops an electrical/pump fault.
However there may be pulsing etc if a sensor is down.
As far as inspection goes there is no difference apart from the ABS lamp check. All parts of the system are examined for corrosion/leaks etc.
The actual brake test on Rollers or on a decelerometer is the same.
Some motorcycles with ABS have to be tested using a decelerometer rather than an RBT.
Kev
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tooner
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Posted: Mon Mar 15th, 2010 08:13 pm |
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Am i correct in saying that all ABS systems are specifically designed to function as a regular braking system if it develops a fault?
Would this then mean that if a vehicle was presented for MOT with an ABS fault light illuminated that you should expect the braking system to operate just like a regular non-ABS braking system?
On the basis stated above should the braking system on said vehicle be inspected in the same manor as a standard non-ABS system?
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golf
Trade Member
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Posted: Thu Mar 4th, 2010 12:49 am |
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as a last resort to resolve the problem you could remove the ABS.
This would bean removing not just the ABS pump & re-plumbing in the brakes, bus also removing the ABS wheel spnsors & removal of any other parts like light in the dash(bulb) ans ABS rings etc.
However to answer you're question yes it can be done if it is fitted as optional.
The vehicle specific information could say standard if the incorret vehicle has been selected by a tester in the past do you would be strongly advised to speak with mercedes & ask them if they made that model with ABS as ptional & could they possibly out it into writing.
I would suggest trying an "auto-electrician" first however as they have the most up to date information and may locate the fault easily & rectify it without giving you all the hastle of removing everything
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Wesley
Trade Member
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Posted: Wed Mar 3rd, 2010 10:09 pm |
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Hi,
find yourself a local diagnostics specialist, who will be able to trace the source of your ABS fault and have it fixed properly.
Last edited on Tue Mar 16th, 2010 12:10 am by Wesley
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KevG
Super Moderator
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Posted: Wed Mar 3rd, 2010 09:21 pm |
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P.S. Dont put your regular tester in the position of having to "Forget " the car has ABS. Its not fair on him.
PPS. Dont attempt the job unless you are an EXPERT on brakes.Last edited on Wed Mar 3rd, 2010 09:22 pm by KevG
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KevG
Super Moderator
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Posted: Wed Mar 3rd, 2010 09:17 pm |
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Hi Jagnut.
Strictly speaking its a fail.
(However if ABS was an option, and you do your installation correctly, how will the tester know it has been removed?)
Kev
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jagnut
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Posted: Wed Mar 3rd, 2010 09:02 pm |
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Hi I'm new to this forum and have a problem with my trusty mercedes W123.
The car was fitted with the optional ABS system which has functioned fine until recently, when intermittently, the ABS light will come back on within seconds after extinguishing, or comes back on if you reverse before driving off. Some days it works absolutely perfectly There are no diagnostics on it, and no wiring diagram. I've changed the front wheel sensors and the speedo sensor, but the problem still occurs some days.I suspect it could be a connector somewhere in the loom or a failing component somewhere on the "black box " controller.
I've had a quick word with my MOT tester, and he says that he will have to wait until he logs on his MOT computer for my test before he can advise me whether the system has the car recorded as having ABS as standard or optional. He says that if it was fitted as standard, then it HAS to be present and working in the right sequence to pass. If it listed as optional, and is present , it must also work correctly to pass, and fair enough, that's the test!
My last option, if it is listed as optional, and I can't finally fix the fault, is to take the whole lot off, replumb the brakes, and have it like about 95% of that model, as standard brakes and no ABS. Can anyone offer a view please whether that situation is a pass or not. I have read a couple of earlier threads on this subject which suggest it should be, but those answers are about 3 years old and I don't know if there have been any rule changes since then.
Many thanks for your advice
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