Lower aerodynamic screen of a front shield of a motor vehicle

A lower aerodynamic screen of a front shield of a motor vehicle, comprising:

• lateral air guides shaped to channel air passing beneath the aerodynamic screen towards front disc brakes of the vehicle,
• each air guide being defined by two substantially vertical lateral walls and by an upper wall linked to upper edges of the lateral walls, each of the lateral walls and the upper wall extending from a front edge of the lateral air guide to a rear edge of the lateral air guide,
• the air guide including, downstream in a direction of air flow, a window defined by rear edges of the lateral walls and a rear edge of the upper wall, from which the air emerges towards the disc brakes,
• the air guide further comprising.a flap that is attached to the rear edge of the upper wall to rotate around the rear edge of the upper wall between a blocking position blocking the window and a retracted position in which it is retracted from the window, wherein each flap is held selectively in the blocking position or in the retracted position by stapling means or clipping means,
• each flap comprising a central portion, lateral portions that project laterally outward from the central portion, and a longitudinal prolongation extending longitudinally from each of the lateral portions,
• the air guide further comprising lower blanks that extend laterally outward from the rear edges of the lateral walls and upper blanks extending laterally outward and upward from the lateral wall at a position in front of the lower blanks,
• the lateral portions of the flap being in contact with the lower blanks when the flap is in the blocking position, and
• the longitudinal prolongations of the flap being in contact with the upper blanks when the flap is in the retracted position.