Traction/braking device (50) for electric wheel motor comprising a stator assembly (2), a rotor (3), a braking system (4) with brake disc (45) rotating as one with the rotor, the stator assembly comprising a stub axle support (1), a stator body (21) and a cover (22) delimiting a stator cooling chamber (5), the stub axle support comprising a securing base (12) intended for connecting the traction/braking device (50) to the vehicle, the stub axle support (1) comprising three axial passages for two fluid pipes (14, 15) and one for the passage of cables (16), these three passages opening into a central zone (11) of the securing base.