Look for what is broken,moving the vacuum line from the factory tee at the back of the manifold won't solve a thing. Fix your brakes first, without them you just park! Make sure your rear brakes are adjusted properly, check brake fluid if dirty replace and bleed out system. i made a great little tool for checking booster, just a small tee that goes between the check valve and booster when you stop motor vavuum should remain in booster, i have bad hearing so it works for me just be sure your check valve is good. After that you can start looking at your vacuum modulator line it's rubber at both ends, look for trans fluid in modulator end. Good luck