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Braking downshift function

Depending on the performed braking action, downshifts are triggered at different speeds and only for as long as the driver is braking. For this reason, vehicle deceleration is determined by a change of the speed-proportional signal (wheel speed or gearbox output speed) or using the brake pressure in the wheel brake system. The optimum shift speed is determined depending on the following values for the individual downshifts from one or several stored characteristic curves:

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