If this part has ruptured or degraded through hydraulic fluid damage, replacement is the sensible thing to do, particularly when it costs so little to ensure the fluid stays within the reservoir vacuum and free of air bubbles. For your entire braking area consumables, check out the online catalogue or 'parts list' fiche for your model, this may help you specify ALL the parts you require for a satisfactory out come when overhauling your brakes.
