Hi and thank you for your help.

I bought my son a Bravo 2007 (198) 1.4 T-Jet.

Long story short I bought it with the left-front ABS giving an error.

A mechanic check it out after having done the diagnostics and pointed out front-left.

The cable of the sensor was interrupted and he fixed it. Still it did not pickup any signal from the wheel. The mechanic told my son that someone put in the wrong CV-Joint which does not have the pickup (gear or something) on the shaft.

After doing some reason and a lot of help from people on the Bravo thread, I am starting to doubt the mechanic ... not about the diagnostics but the fix. He told my son we will need a new CV-joint.

Where does the ABS sensor get the signal from? Someone told me the "pickup" is from the ball bearing in the hub.

I will really appreciate if someone can tell me where it picks up from on the wheel? I search Google and everything out there but cannot find a picture or diagram showing me the exact point it pick up from.

Thank you for your help.
Greetings from South Africa.

It's should have a abs ring on the outside of the joint
Basicly a ring with magnetic sections on the the abs sensors can pick up

chris3234 said:

It's should have a abs ring on the outside of the joint
Basicly a ring with magnetic sections on the the abs sensors can pick up

Click to expand...

No, we've been through that on the Bravo thread.
deonholt have you checked the other side yet. There is probably no ring on the CV there either. Mechanic can only say wrong CV if other side is different. Starting a new thread will not help until this question has been answered.
Ask the previous owner, or the fitter of the CV if possible, has the wheel bearing been replaced?

You say the wiring was 'interrupted'. I'm guessing this means broken. These sensors create small voltages, and a poor joint will cause incorrect readings, that the control unit will object to. Even a well soldered joint might not be good enough.

Very likely that a new sensor, a good one with correct connector already fitted to the wires, will sort the issue. 'Universal' sensors without connectors can just repeat the issue.

The bearing has seals on its faces. One side will have a reluctor ring built into this seal, and that face has to be fitted into the hub inwards, to run next to the sensor. If the bearing has not been replaced, this will not be an issue.

portland_bill said:

No, we've been through that on the Bravo thread.

deonholt have you checked the other side yet. There is probably no ring on the CV there either. Mechanic can only say wrong CV if other side is different. Starting a new thread will not help until this question has been answered.
Ask the previous owner, or the fitter of the CV if possible, has the wheel bearing been replaced?

You say the wiring was 'interrupted'. I'm guessing this means broken. These sensors create small voltages, and a poor joint will cause incorrect readings, that the control unit will object to. Even a well soldered joint might not be good enough.

Very likely that a new sensor, a good one with correct connector already fitted to the wires, will sort the issue. 'Universal' sensors without connectors can just repeat the issue.

The bearing has seals on its faces. One side will have a reluctor ring built into this seal, and that face has to be fitted into the hub inwards, to run next to the sensor. If the bearing has not been replaced, this will not be an issue.

Click to expand...

Thanks for the reply.
The car is not with me, 450km away.

This is why I am trying to get as much information as possible about this problem, so that when my son visits again, I am prepared to fix the problem. I can ask him to look but if I cannot tell him what to look for, it will not help.

I have in the meantime learned that the magnetic ring fits on the bearing.
Yes, by interrupted I mean that it was broken. This is why I have decided to buy a new sensor and send it to him as this is the most easy to fix and check if the problem remains there. Now I must just find a place to buy it from. Last resort will be agents as they are super expensive.

Thanks again for all the help. I'm learning every day.

deonholt said:

Thanks for the reply.
The car is not with me, 450km away.

This is why I am trying to get as much information as possible about this problem, so that when my son visits again, I am prepared to fix the problem. I can ask him to look but if I cannot tell him what to look for, it will not help.

I have in the meantime learned that the magnetic ring fits on the bearing.
Yes, by interrupted I mean that it was broken. This is why I have decided to buy a new sensor and send it to him as this is the most easy to fix and check if the problem remains there. Now I must just find a place to buy it from. Last resort will be agents as they are super expensive.

Thanks again for all the help. I'm learning every day.

Click to expand...

I had already replied on your other thread about your same problem.
To repeat - I Looked up the part numbers for your car and your car should be fitted with the wheel bearing that has the abs magnet built in.

jackwhoo said:

I had already replied on your other thread about your same problem.
To repeat - I Looked up the part numbers for your car and your car should be fitted with the wheel bearing that has the abs magnet built in.

Click to expand...

Thank you. For now I am going to order a new sensor. The one wire was broken and was just joined again. Maybe the bearing has the magnetic ring and it is the asb sensor.

Going to order this if it is not the sensor that is the problem:

deonholt said:

Going to order this if it is not the sensor that is the problem:

Click to expand...

I’m not convinced and it could be a waste of time, that is a wheel bearing and has nothing to do with the abs sensor! See pictures below.

Honestly change the sensor at the very least that will likely work, if not then the wiring further up is still the most likely candidate.

If the sensor and wiring are all ok then the drive shaft is what the abs ring is part of. So you’d need a new cv joint at the very least.

I’ve attached two pictures one shows the location of the abs sensor in the back of the steering joint and the second shows the grove in the end of the drive shaft in which the end of the abs sensor fits. The wheel bearing has nothing to do with the abs.

That said you can change everything and still find there is a fault in the abs unit itself

Once the sensor is changed if no luck then I’d want to hook the car up to diagnostics and watch the output of the sensor when the car is moving.

The rear wheel bearing are very likely to have the abs ring built in because everything is built in, it is the hub for the wheel as well. The front wheel bearings are pressed in, the. There is a large Circlip in place to stop it moving, the circlip sits between the bearing and the abs sensor. If the sensor ring is part of the bearing then it could be something as simple as the bearing being the wrong way round. I don’t think that’s the case and almost every abs sensor problem I’ve ever seen has either been the sensor or in very expensive cases the abs unit

That video is from federal mogul parts.
The paper clip test for if both seals are rubber is particularly helpful.

jackwhoo said:

https://youtu.be/8H6REkbEkuA

Click to expand...

Well today I've learnt something new that I was not aware of before.