painmedsplease

I was wondering what brakes have to do with this issue? I am experiencing rough idle right now after fuel injector replacement. This was a non-issue before but someone opened the brake fluid reservoir and now we have really hard brakes (will have to bleed). But it now has a rough idle and dies whereas before we were experiencing a mis-fire at highway speeds after all OEM coil/plug replacement (three years ago) and ECM being fixed.