I have a 90 Ford f250 with a 460 and the brakes were working great on them until the other day I was pulling a trailer and I blew a rubber line. So I fixed it but now I can't get it to bleed. I've bee. Trying to bleed it from right off the tires but nothing's working. Any suggestions?

 

A few things ,
where was the line that let go, did you lose all the fluid in the master cyl and did the pedal go down to the floor more than once ?
First if the pedal did go all the way down you can be pretty sure the cups in the master cyl have been damaged by running over the grit and sediment in the bore. Also, that means there is air in the entire system and you might need to start with bleeding the replacement master cyl , then the rears and then the front. This opens a whole new can of worms because the bleeders on the wheel cyls on the rear may not be cooperative and open easily for you. Then the front caliper bleeders may not want to cooperate either and now here comes $$$$. If you are careful you might be able to get the bleeders open and a lot will depend on how long they were on there and where you drove (salt etc.) . This is what I found happened and it may not happen to you, lets hope you get lucky.
You are probably aware there are no squealers on the front pads and you have to keep an eye on them frequently or the same thing can happen where the pad when worn will allow the piston of the caliper to go so far out that the brake fluid goes out too and that whole scene comes along.