Okay, so I blew the main rear brake line yesterday . It broke because of rust (under one of the support brakets, the same ones that hold the fuel lines). New line has been installed, but I can't get fluid to the rear of the car. I pulled the line at the master cylinder to see if I was getting fluid there. I'm not. Even if I push the brake pedal with the line loose, nothing comes out of that hole. Now, I pulled one of the front lines at the MC, and pushed the pedal. Fluid sprayed everywhere. Now, I'm assuming that the hole for the rear line (at the MC) should spray in the same fashion when the pedal is applied, correct? I'm just double checking before I spill the wallet on a new MC. Could someone please advise? Thanks!

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1989 300E 144K