Issue installing ultegra 8070 disc brakes So I've been building up my new road bike and I've run into a bit of a pickle: The groupset I've bought includes the ultegra 8020/8070 brakes and shifters with the "j-kit" or "easy hose joint system". 

From my understanding, these come with the mineral oil already topped off in the hoses and the shifters, and all I need to do is mount the calipers, route the hoses, remove the rubber caps on the hoses and shifters and connect everything together.

However my issue is that the rubber cap on the end of the hose is too big and won't pass through the chainstay and the downtube ports for the rear brake. The same thing also happens for passing the hose through the fork for the front brake.

I can't remove the rubber cap to pass the hoses through the ports as oil will surely spill everywhere inside  the frame. Am I right to think that the only solution is to buy a new set of hoses and fittings and just junk the ones already installed?