Abstract: A sealing cap on ball-and-socket joint made of elastomer with openings on both ends, a first one of larger diameter to be coupled to the top of the ball-and-socket joint case and a second one of smaller diameter to be coupled to the body of the spherical end pin. The conventional sealing ring is eliminated by making a channel on the top of the ball-and-socket joint case that has a deformable external flap or flaps to fix this opening of larger diameter of the sealing cap inside the channel provided on the top of the ball-and-socket joint case. The sealing system provides an improved sealing to the system and fastening the sealing cap to the inside of the channel, which, consequently, makes difficult the entry of any impurity inside the ball-and-socket joint and does not allow the sealing cap from getting loose from its mounting position.