In order to get an extremely fast ramp up in friction during the first 0.5* second of application and to try to compensate for the weak leg muscules and slow reaction time of typical average male/female owners they used brake assist pads.* 0.5 sec composed of 0.2 to lift foot off throttle and 0.3 from the instant brake pedal is touch until the brakes respond!These type pads wear fast to do their job. IN REDUCING BRAKING DISTANCES BY 10-20 feet compared to convention slope pads.
When you are traveling 88 feet per second [60 mph] you may travel 26-30 feet before conventional pads are fully engaged at maximal friction.
Luckily changing pads usually doesn't lengthen panic stops by more than 15-25 feet.
Not sure the average owner can differentiate in 20 feet braking without actual measured tests............they feel ok but they never bother to test until they rearend someone or a tree or just run off road..........luckily the mind adapts eventually.
OEM pads must not require more than 40 lbs of pedal pressure to certify whereas aftermarket may require more 50,60,70........less important if you have strong legs [light women?]
"Total stopping distance consists of three components:
Reaction Distance. First. Suppose the reaction time is 1.5 seconds. This means that the car will travel 1.5 x80.67 or 120.9 feet before the brakes are even applied. Brake Engagement Distance. Most reaction time studies consider the response completed at the moment the foot touches the brake pedal. However, there is an additional time required for the pedal to depress and for the brakes to engage. This is about .3 second, adding another 24.2 feet. Physical Force Distance. Once the brakes engage, the stopping distance is determined by physical forces (D=S²/(30*f)) as 134.4 feet.
THIS IS WHERE THE G35 FAST WEAR PADS EXCELL IN SAVING 15-20 feet!
Total Stopping Distance = 120.9 ft + 24.2 ft + 134.4 ft = 279.5 ft Almost half the distance is created by driver reaction time. This is one reason that it is vital to have a good estimate of speed of human response. Below, I give some values which I have derived from my own experience and from an extensive review of research results. "
http://www.visualexpert.com/Re....html
Don't make the mistake of assuming racing/performance pads will shorten the 60-80 mph single panic stop braking distances!