A ball joint includes a suspension house comprising an inner side, a house neck and upper flange, wherein a bearing ring, having a liner fastened to its inner surface, and an upper mating surface fastened to the corresponding mating surface on the lower side of the house; a suspension ball, complementary to the inner side of the house, comprising a ball neck and lower flange, the ball having a recess on the inside of the ball, the recess comprising an inner seal ring positioned on a bias ring in the recess; the seal ring providing a seal contacting the inside of the house and a piston seal contacting the inner surface of the recess wherein the bias ring biases the seal ring parallel to the axis of the neck and away from the bias ring.