ok so i searched for some threads about breaks and i didnt find any that quite answered my question. ok so it never fails that whenever i go down one of the hills in my neighborhood that when i hit the brakes the car vibrates and shakes so much i think its falling apart. I started to notice this in other places too. My freinds said to check the brake fluid but i dont know where that is or what to use and im not sure if thats the problem. Any advice?