The maximum capability of weak females to actuate manual brake systems and power brake systems with power failure depends upon a number of variables. The following variables will be discussed and preliminary conclusions made on their quantitative effect: percentile of population to be covered, sex, age, force within a trial, repeated trials, left vs right foot, static vs moving vehicle, location of pedal to driver and seat, and preferred seat location.
Using many assumptions and skimpy data, a 5% USA female, seated in a properly adjusted seat, for a panic stop will exert about 215 N in a moving, full-size USA vehicle with power brake failure.
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