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"Drive by wire" is a term not only used for accelerators. Some day most car functions may be drive by wire, steering, BRAKES, cooling etc. Maybe these Toyota's have partial drive by wire brakes. That may account for the lack of braking power. Maybe more than one electronic system is failing. If I were programming a cars computer I may not want the brakes to engage at WOT. If you think about it the only 2 times you would want that is brake reving a car for burnouts, or with a throttle malfunction.
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