My front right brakes aren't acting right. They suddenly stopped responding to anything. When I put it in park, it can still roll and when i jacked up the front and put the car in Drive the right wheel spun while the left sat there.

I took off the wheel and found out that the brake pad is just sitting on the rotor, so while i'm driving, it's still braking. It's very light though so I can still go without much faulty steering problems. But after a long drive the wheel will get burning hot.

What do you think the problem is? Leak in the lines somewhere near the tire? Air? I haven't filled the brake fluid in awhile, and it's still between Min and Max, and this problem just started occuring.