Can you see were it is leaking at? If it is getting the steering shaft wet up by the fire wall then the seal between the Hydro-Booster and the Brake master Cylinder if shot and the O-ring between them is bad. (I Hope not) Mine was. If so you need to replace both of them as the O-Ring is not available separate. If it is just the Pump then yes it is a good idea to reseal the Vacuum Pump as taking them out as a unit is the easiest way to go. Good Luck Harry
02 Patriot Blue 3500, HO 6sp. , Leather, AFE Stage one, TAG, No Muffler, Smarty, Gauges, Spray in Bed Liner, PacBrake, Air Bags, DeeZee Running Boards, Stainless wheel trim and side panels