ABS light need help

[Dan366757]

Hey everyone how are ya's, a couple of weeks ago went and got 2 new rubbers on the rear and new brake pads all round on my vs calais. On the way home the abs light came on, checked the fuses and all good, went for drive around the block and it didnt come on the next day i got a klm up the road and it came on again and for the last couple of weeks its been coming on at random times and staying on till car is turned off. any ideas on what i should check would be greatly appreciated sorry for the long story.

[WhiteOx]

Check the ABS for error codes:
ABS Error Codes

[Dan366757]

Cheers mate ill try them today

[Dan366757]

I've checked the error codes and it came up with 28 wheel speed sensor frequency error, what does that mean and how do i fix that.