I think we may be talking two separate things. "Ice Mode" as it's known to autocrossers, is when are trying to get maximum braking while cornering, and the inside rear tire is unloaded. This will cause inside rear to lock, and thus the brakes to back off, and then all of the sudden you loose braking ability. This is what pretty much all of us autocrossers run into.DrmCtchr said:OK damnit quit guessing:
Ice mode is when the brake booster is not preloaded with vaccuum to assist the braking .. its similar to not having the car running and ending up with manual brakes. This is due to going from WOT or at least +psi boost to brakes too quickly. The engine hasn't had time to develop vacuum by the time you are asking the braking system to use the vacuum.. that hasnt yet built to a value that actually assists the brakes.
well ok one more driving style fix ... press really freaking hard on the brake pedal the brakes are still there and will work as if the car isnt started they will still work you just have to really press em.
When this happens, the pedal goes to the floor. The ABS is working, but in autocross, it's often hard to feel/hear it working. You can try to push the pedal harder, but you don't get any additional brake application (again, because the ABS is cycling).
If Ken is having problems straight line braking, it might be what you are talking about. Another thing he should double check is his brake fluid level. I found my fluid level getting low this year, and it caused a bit of a soft pedal, and occasionally it took a split second before the brake apply I asked for actually started.
As for pumping the brakes, there really isn't time to do something like that in autocross. Your brake applies are typically so short in duration, they'd be the total equivalent of at most 2-3 pumps of the pedal.
Usually what I feel when I'm left foot braking (and using gas and brake at the same time) is just the loss of assist, and results in a nice, firm pedal. That's not the case once the ABS starts cycling. Once ABS starts, the pedal will drop significantly closer to the floor.
That's just my $0.02, for what it's worth.