You have a inner seal leak. You will need a few tools to repair. 1 -3 inch socket, 1- 1/12 socket, Jack, a few 1/2 sockets 1- slide hammer, 1 set of rear axle puller tools, 1 inner seal, inner grease seal, outer grease seal, 1 boot if needed, tube of silicon, 1 wheel cylinder rebuild kit, just...