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[bigbadee]

just went out in the wifes car Citroen xsara diesel all was fine then when braking at low speed the abs came into action no warning lights, abs light still comes on then goes out arfter 2 seconds as normal so in my small mind cant be a sensor or am i wrong any ideas .
ps have taken the abs fuse out and the brakes seem to work fine no dragging or pulling .

[martin42]

so if abs is working it means a wheel locked up,was the road wet??

[bigbadee]

hi martin no road was dry but the abs is coming in/on all the time if stopping from a slow speed when braking hard it works as normal but it is coming in when it shouldnt. car has just passed its mot and on the brake test all the brakes were fine (no ballance problems etc)

[henryd]

It is probably a sensor fault, it may be ok on self test at start up but is struggling to read wheel speed   when moving,needs plugging in and live data read on the move

[tidla]

Wot he said^^^^

[Andy B]

what about the reluctor ring? Smart cars like SWMBO's tend to rot the ring which gives similar problems

[henryd]

what about the reluctor ring? Smart cars like SWMBO's tend to rot the ring which gives similar problems

Could well be Andy,happens a lot on Renaults when the ring cracks and freewheels on the driveshaft,not seen it on PSA but doesn't mean it can't happen.

[bigbadee]

thanks all had a good look at it to day and your right andy the ring is loose it had split and was jamed by the sensor so not spinning at all so telling the wheel it was locking up,just hope the sensor is still alright will  fit the new ring first and see what happens at least i know what wheel to look at ?
Just need the weather to be kind.

[Andy B]

...
 and your right andy the ring is loose it had split and was jamed by the sensor  ....

Wahey! I was right. 

[henryd]

...
 and your right andy the ring is loose it had split and was jamed by the sensor  ....

Wahey! I was right. 

So you were 

[henryd]

thanks all had a good look at it to day and your right andy the ring is loose it had split and was jamed by the sensor so not spinning at all so telling the wheel it was locking up,just hope the sensor is still alright will  fit the new ring first and see what happens at least i know what wheel to look at ?
Just need the weather to be kind.

If the ring has just cracked but is otherwise good just clean it up and the driveshaft and use JB weld to glue it on,put a cable tie around it to hold it in place while setting

[Andy B]

thanks all had a good look at it to day and your right andy the ring is loose it had split and was jamed by the sensor so not spinning at all so telling the wheel it was locking up,just hope the sensor is still alright will  fit the new ring first and see what happens at least i know what wheel to look at ?
Just need the weather to be kind.

If the ring has just cracked but is otherwise good just clean it up and the driveshaft and use JB weld to glue it on,put a cable tie around it to hold it in place while setting

Mercedes' answer is a complete drive shaft, but you can buy aftermarket rings separately quite cheaply. Maybe if it's a common Citroen fault, an aftermarket reluctor ring is available 

[bigbadee]

thanks again all it was just cracked but (sledge hammer to crack a nut)its now in two have ordered a new one ,ring only £2.99 of the bay just got to remove the hub and hope its not to tight a fit will let you know when it arrives. Hopefuly will do this weekend if the weathers kind,then just the mig to sort and of fishing we will go.

[henryd]

thanks again all it was just cracked but (sledge hammer to crack a nut)its now in two have ordered a new one ,ring only £2.99 of the bay just got to remove the hub and hope its not to tight a fit will let you know when it arrives. Hopefuly will do this weekend if the weathers kind,then just the mig to sort and of fishing we will go.

Do not try and tap it on as it will crack,heat the new ring in the oven as high as it will go and drop the driveshaft joint in ice for an hour before fitting,it will drop on and shrink itself to fit

[bigbadee]

would have tried to tap it on(with  me sledge) just saved me a lot of wasted time thanks