French translation: Freinage par reduction de (rapports de) vitesses
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Explanation: IF (please check) this is an automatic gearbox with a planetary gear arrangement OR a transfer gearbox on a 4x4 vehicule, then the "brake" is a band brake (actionned by a hydraulic valve) that prevents the one part of the planetary gear from rotating, thus resulting in a reduction.
The planteray gear is then a "réducteur" and the brake is a "frein"