ABS2 Internal Relay

[Paul Young]

Does anyone have guidance on how to test this works, please?

I have 2 abs2 units, one on the bike and another that I picked up a while ago. The one on the bike has a plunger test failure so is not cycling at start up, even with a new battery, so I’d like to start testing components in the other one that I can then swap across until I suss what is wrong.

Also, does anyone know of a source for these relays?

Thanks

 

[Steptoe]

Also, does anyone know of a source for these relays?

They aren't your usual common or garden relay.. i've gathered my selection of spares over the years from defunct units.

 

[Paul Young]

They aren't your usual common or garden relay.. i've gathered my selection of spares over the years from defunct units.

Thanks Neil, I was hoping you would see this and give the benefit of your wisdom…

I took a look inside the casing and it has an unusual design, so are you aware of any suppliers or how best to test that one is working?

Fundamentally, it looks like a generic relay with a different set of contacts attached, so I would have thought that an alternative could be sourced and made to fit. Is this the usual cause of plunger faults?

 

[alanbmwgs]

Hi Paul, I may have one, I had my fully functioning ABS 2 removed by Roy Garner. He gave me all the removed parts back, I don’t know if this relay is still in situ. Is it located with all the other fuses and relays ? I’ll have a look �� and if it’s still there you can have It.

Alan.

 

[Ian J Hartley]

Also, does anyone know of a source for these relays?

Thanks

Google search the part number item 5. (61362306526)

It’s a FAG labelled relay and there is a BMW procedure to replace it. So if all else fails, then try them.

Removing the relay it should have a contact diagram stamped on the side which will help with fault finding. It will be a high current rated relay so prone to carbon build up on the main contacts. Sometimes it’s possible to remove the cover and clean the contacts inside, refitting the cover afterwards.

 

[Paul Young]

Hi Paul, I may have one, I had my fully functioning ABS 2 removed by Roy Garner. He gave me all the removed parts back, I don’t know if this relay is still in situ. Is it located with all the other fuses and relays ? I’ll have a look �� and if it’s still there you can have It.

Alan.

Thanks for the offer, Alan. I’ll get in touch if I need it, but I’ve currently got 2 to work with

 

[Paul Young]

Google search the part number item 5. (61362306526)

It’s a FAG labelled relay and there is a BMW procedure to replace it. So if all else fails, then try them.

Removing the relay it should have a contact diagram stamped on the side which will help with fault finding. It will be a high current rated relay so prone to carbon build up on the main contacts. Sometimes it’s possible to remove the cover and clean the contacts inside, refitting the cover afterwards.

Brilliant as always, Ian.

I never thought that it might break it down in the parts list… How can you tell it’s a FAG relay?

I can tell from the price that it’s a substantial part but no one has yet said that it’s a common fail point that gives the plunger fault. Does anyone know?

I used to have a 124 series Mercedes’ that had the common fuel pump relay failure. A replacement part was £105 in the ‘80s but you could carefully open it and spot the dry solder joint that the heat caused. Cost £0 to apply a soldering iron and fix it… Won’t it be great if we find it’s this easy to fix an abs unit..?

 

[Ian J Hartley]

I never thought that it might break it down in the parts list… How can you tell it’s a FAG relay?

When you Google the part No and select the images function. You get a host of pictures many of which are like this.

Also the relay part No S40958.002 also seems a good number to search.

It looks like a special relay manufactured by Tyco specifically for FAG, which is why it’s ridiculously expensive.

 

[Ian J Hartley]

You may find this helpful if you are going to dismantle the ABS module. A fairly detailed write up from the American forum.

https://advwisdom.com/a/abs-2-modulator-repairdisassembly-and-analysis-of-a-abs-2-modulator/

 

[Paul Young]

You, sir, are a very useful person to know…

Thanks for your help.