On my TS the ABS light would flicker on and off. There was something you could do to get it to come on but I cant remember, it was a while ago.
I took it to a gravel car park to test it out, when the light was off it would work and low and behold, when the light was on it would skid to a stop.
I can't remember why (maybe budget) but knowing the discs and pads were shot I left it in to my mechanic to replace them and the brake fluid but I didn't change anything to do with the ABS or anything else.
When I got the car back the ABS problem had gone completely and never came back in the couple of years I kept it for.
So, to cut a long story short, it might be worth checking out the condition of the rest of your braking system first. I suspect it was dirt in the fluid causing a blockage but who knows.