Abstract: This device, which is intended to brake a wheel of a vehicle rotated by a ive shaft carrying at its free end an epicyclic train reducer housed in a casing, is characterized in that it is fixed on the outer face of the bottom of the casing and comprises a watertight case enclosing at least one friction disc interlocked in rotation with the sun wheel of the reducer, as well as an annular plate for moving the disc axially and applying it against at least one internal friction surface, this plate being itself axially movable towards the disc under the action of control means situated inside the casing.

Abstract: In this device, two stacks of discs form at least two sub-assemblies separated by an axially movable intermediate pressure disc, the first of these sub-assemblies being located between the intermediate pressure disc and a stop integral with one of the bodies, whereas the second is located between the intermediate pressure disc and an end pressure disc also axially movable, the control means exerting their action in the direction of the stop, first of all on the two pressure discs so as to cancel out the clearances between the discs of the first sub-assembly, then on the end pressure disc so as to cancel out the clearances between the discs of the second sub-assembly and finally on the whole of the discs of both sub-assemblies so as to compress them.