Where you pulling big black lines on the road with squeeling and smoking tires or did you have the idea you where accelarating?

Because a lot of people believe the abs wasn't working because the felt the car accelerating (stopping decelerating is a better description) The number one function of abs is to relieve pressure from your brakes to resolve lock up. (not to prevent!)
This is to enable you to steer around the danger. When the sensors notice the wheels are all spinning equally it will build up pressure again until the wheel starts locking up again. etc etc This happens in a fraction of a second.

It is easy to check if your abs works just find an empty carlot and slam on the brakes. I wouldn't be to worried as long as you see your dashboardlights working during startup check so you are sure the bulb hasn't blown.

ps are you familiar with stopping distances at speed. To make it more visual for you at 90 kilometers per hour you are driving 25 meters per second and the heaviest decelleration is at speeds below 50 kilometers per hour (when you feel your head moving forward)

At the advanced drivers courses i always learned and now train students that at speeds above 50 kilometers per hour you use less meters/time to avoid the danger than to brake for it.

I hope this makes any sense to you guys, it''s a bit hard for me to explain in english.