An air-guidance device is provided for the front of a vehicle and is adapted to be attached near an outside edge near the bottom of the motor vehicle. A portion of the device is located on the bottom of the vehicle and extends longitudinally towards a wheel. This portion is provided with air-guiding channels used for cooling the brakes. Each air-guiding channel is constructed such that the bottom portion of the channel facing the road is open over at least a partial area of its longitudinal length. This arrangement provides cooling of the brakes and is simple to construct and mount to a vehicle.