ford focus abs juddering problem

[owensblues]

When i am driving you can hear like a pump/motor running noise and when you press brake pedal down the pedal judders and then the brakes work fine.
Then its fine for a little time,then itkeeps on reacuring

Can any one shed any light on problem

 

[^neo^]

Its probably a wheel speed sensor playing up. Check the connections to them, pull apart and wd-40 them to make sure water hasnt got in.
If that doesn't sort it, then may be air in the system

 

[jayrs250]

cracked abs ring on driveshaft

 

[Stivino]

Sounds like a reluctor ring to me too.

 

[Infidel]

Had the same thing on mine usually happend above 40 mph after applying the break turned out it was a knackered rhine (i think thats how they spelt it) whatever that is on the rear nearside hub.