ABS-fault light-any known probs,couldnt find

[howesy]

Couldn't find any thing specific for the series 3 units, does any one know of problems i was driving and the ABS light came on down a steep grade
(no heavy or frequent braking).I hit the anchors hard and it definately was not working (wheels locked up) I checked fluid and was fine and shut engine down then started up again and came up trumps and its been a day with no repeat. Anyone experienced something similar? would love to hear about it.