Abstract: A bearing having an outer race provided with end bores, inner races provided with wear surfaces located within the end bores, and rolling elements arranged in two rows between the races, is closed at its ends by seals which prevent excessive pressure from developing within the bearing during operation or relubrication. Each seal includes a metal case having an axial wall and pair of spaced apart radial walls. The axial wall is pressed into one of the end bores of the outer race, whereas the radial walls form a chamber that communicates with the interior of the bearing through apertures in the inner radial wall.