I replaced the original hydrovac after bleeding the thing 100 times and then realized that was where my brake fluid was going. When I put the new one on I noticed immediatly the bleeder was not where the old one was. Being a newb I thought "it must not matter because they surely would have assembled it correctly". It makes total sense that the air would need to be bled on top. I even had that concern at the back wheel cylinders because the bleeders are on the bottom of the bottom wheel cylinders. But because of the banjo connections the bleeder could not go on the top outlet. Anyway, glad to have brakes, live and learn.