I have a fiesta mk2 master cylinder and it has 4 outlets for brake pipe is there a specific 2 for the rear brakes and if so which to are these? Bottom 2 or top 2?

the ones near the brake pedal end are the rears the others for the front brakes

So there split back and front rather than diagnols?

yes thats correct

thanks mate, just wanted to check as i literally had enough copper pipe to make one mistake before i had to buy another reel.