I changed from my stock pads to Pagid Oranges tonight, then took the car for a test drive and now the ABS activate under moderate braking (way too early for lockup).

I also mounted new MPSCups on stock 18" wheels at the same time. I'm on dry pavement.

I am NOT an expert, but I had installed the pads and tires together several weeks ago and tested them out. I had also flushed the brake fluid and replaced with Motul 600. Everything was fine then, and I changed back to street pads/tires.

Could I have bumped/broken an ABS sensor? What should I look for? Any ideas?

Help! I'm scheduled for a track day tomorrow!