Even the tiniest rupture may allow your hydraulics to become aerated, with the resulting spongy brake's scenario. Replacing this item as a matter of course during your brake service or overhaul is just good, safe practice. For all the other essential replacement consumables, check out the online catalogue or 'parts list' fiche for your model, and enjoy low prices and a prompt delivery service
Note: this part is superseded by 45520422026.