Abs

can somebody please tell me how long the ABS pump should "operate" for when ignition key turned before starting? mine operates for a fraction of a second, is this correct? the ABS light stays on when travelling, it's been on 2 diagnostic tests, the results were fns ABS problem, i renewed the fns ABS sensor, tested again with same result. wheel bearing is ok. any suggestions most welcome. Thanks. Doug.

have you checked the needle roller bearing as well as the other bearings? all my bearings were ok, no play or anythin but i was still gettin n/s/f ABS sensor fault. stripped it all down and my needle bearing had parted company with its needles!!

new bearing = fault gone

thankyou very much, I'll try that and let you know the outcome.