On my 93 f250 4x4 7.3 idi i been having problems with my brakes. 2 weeks ago my brakes went out out because the master cyclinder went bad, so i change it bled it like the instructions said n bled the brake lines, it worked fine for a week. Then it went out again this time some junk from the resisvor cloged it up plus i dont think i bled it good enoth so i changed it, this time i bled the master cyclinder without the resivor so i cloud see there was no air bubbles n i also replaced one of the brake lines cus it had a pin hole in it. Now three day later i have no brakes only little bit of rear brakes. Anyone know whats causing this thanks

 

My guess would be that you have air in the system.
You need to make sure that the master cyl is properly bled, then bleed the brakes in this sequence, right rear, left rear, RABS module, right front, left front.

 

I did bleed th brakes in that order n it took me 15 min to get the air out the master cyclinder

 

Then either there is still air in the system or you have a bad master cyl (I know it`s new but means nothing these days).
My money is still on air in the system (assuming no fluid leaks).

 

Ya i think its air too but the first master cyclinder wasnt pumping fluid to the front brakes it was just pushing it in to the resivor n i think this one is doing the samething

 

I think you have air in the system. Did you bench bleed the master cylinder?

 

Ya i bench bled it but i think it was the lines n calibers there r the orginals, so i went to advance n got two new calibers, brake hoses, the steel lines that goes from the master cyclinder to the driver side brake hose n the one that runs from the driver side to the passer side n im going to rebench bleed the master cyclinder