My 2 cents. Def got a leak in your brake system. Whatever find that and you should be fine. Bleed all the old fluid out. As for the code, have you checked your timing and all your plugs and wires? When I got my runner the timing was way outta whack, I think my timing gun was like 20 bucks. Ive heard bad timing can throw that code. And I know you got the knock sensor code or whatever, but maybe check your fuel filter/fuel pump? It should be pretty easy to pull the filter and see if its all gunked up. Good luck.