I may have experience this. I like to think of myself as a skill driver and very defensive. Anyways, while I was going to pick up my girlfriend late at night, 24 hours after our snow storm. The roads were still a little icy but nothing major. I was following a car. I was going about 45 mph. I am pretty sure they were a novice drive as they braked on an icy bridge. They were about 100 feet or so in front of me. I begin to brake too, lightly. But, when I lightly depressed my brake. The begin...well how do I put this... pulsating as if traction control and abs were kicking in. My car wasn't skidding or sliding. Just going straight. I felt as if the car didn't have any braking power. Well, my car is equipped with the cvt, so I just kicked it down a gear. Luckily I had kept enough distance in front of me to avoid any catastrophes. But I did think it was odd the car didn't even slow down.