So my front passenger side brake line was bent going through the engine bay and I need to replace it. Just the problem is where the metal brake line connects to the brake hose in the wheel well is rusted solid. I've tried everything and it won't crack, any advice? Any one have the same problem?

 

Soak it in PB blaster overnight. That stuff is pretty nasty.

 

Hopefully it'll come off the body side but I'd cut it at the rubber hose section. Get a new caliper and hose, call it a day.

Only if you can get it off the body. If the lines rusted to the body you screwed. But it may still be easier to access with hose and caliper out of your way.

 

since you do not need that steel line anymore, Cut it.
The Flex line has a 17mm hexagonal shape on it at the fitting so that you can put a wrench on it.
Use the wrench to hold it,use a 10mm deep socket to get the little piece of line off and you are now Fresh to put another line on.
VICE GRIPS works too..(many a 10mm flared nut has been attacked with them!)