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      08-10-2012, 05:48 PM   #12
Roger Murdock
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Drives: 2006 MZ4C, 2015 Fiat 500e
Join Date: Oct 2007
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Originally Posted by Meeni View Post
Very good summary Hack!

If I may suggest a comment, not only ABS is better than locked wheels, but it is also better than "shy driver afraid of the brakes". It appears from accident statistics that, on open roads, many accidents could have been avoided if the driver had used all the ABS available braking power, instead of pressing mildly the pedal and using only 60% of possible static friction braking. Said otherwise, the performance of on-off ABS is inferior but close (in the general case) to perfect static friction, and road conditions being unknown, vastly superior to human typical underestimation of perfect braking.

This is why it is good advice to do "rapid ramp up" with ABS on open roads, because it limits the typical pitfall of under-soliciting the brake. Now it is clear that on a racetrack, a competent driver that has made several runs already will do much better than ABS by applying the proper technique you described (btw this is what I had been taught as threshold braking - the constant pressure thing, I've never heard of this before as a proper technique).
Correct, the graphs assume that you are driving sans ABS, which most race cars are not equipped with. With the inclusion of ABS, then it is preferable for most average drivers to quickly ramp up the braking and hold past threshold for the quickest way to slow down.

Of course, if you actually ramp up the brakes correctly, your ABS won't kick in until much later in the pedal travel, allowing you to actually brake harder...
The hell I don't! LISTEN, KID! I've been hearing that crap ever since I was at UCLA. I'm out there busting my buns every night! Tell your old man to drag Walton and Lanier up and down the court for 48 minutes!

-Roger Murdock