My ABS light when on a while ago and I was pissed.
I thought maybe it's the light so I slammed on the brakes and my car just screeched and slid.
SO I went home ready to see what's up. I turned the car off, turned it back on and the light was gone. I took it for a drive, hit the brakes and my ABS system worked fine.
My only suggestion is to try and reset your ECU and see if that helps.