ABS after lower spring install

The other day I installed a set of lower springs on my 2000 GT. After everything was put back together I had the ABS light on before I even got out of the driveway. I took everything apart and found one the had a bunch of crap stuck to it and cleaned it off. This morning I took it to work. It stayed out the whole 20 min. drive to work untill I pulled in a parking space and then it popped back on. I'm not sure why it would do that? Any ideas?
 
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