I'm (was) driving a 97 Avalon, good maintenance and I really only drive about once or twice a week, (about 7k miles a year).
I was traveling down a highway a good 6 or 7 car lengths behind when the cars in front of me all hit the brakes, well I put my foot on the brakes enough to slow the car (normally slow the car), but I didn't slow down much.
There was presure from the pedal, but I just wasn't slowing down as much as I should have been. This was in about 20 to 30 feet.
So I stepped a little harder and harder on the pedal until I was putting all my weight on it, I could feel the car braking harder but still not enough. The pedal never bottomed out.
The thing is the way it felt to was like the brakes were stuttering, meaning grip--slide--grip--slid. This was on a day when the temperature and humidity were really high. well I rear ended the car in front of me, Luckly no one else hit anybody.
When the cars collided the front of my car was angled down. and the other cars rear was up.
The tires have about 4 to 5k miles on them (September). Traffic was smooth before the accident so I wasn't using the brakes so I don't think they were overheated. I'd been driving normally and didn't notice anything with the brakes. The pedal was about normal, not mushy. I had overheated brakes once in the hills in California, that will never happen to me again.
I've been talking to a few friends, (no car mechanics here) and some of the ideas we've wondered about were was it the ABS, were the tires slidding on the rims, was there anything slippery on the road, I didn't see anything on the road.
Side note, Accidents really do happen in slow motion.
The car I hit has some bumper damage, my bumper looks fine but my grill, lights and radiator died and the hood waffled. The car door would open, but it was hard and noisy.