Another thing is when you first apply the brake pedal, while it has been sitting for at least 30 seconds is it hard or does it go near the floor? For arguements sake, if you first apply the pedal it goes 3/4 down then the next immediate pumt it only goes 1/2 way down then you have a brake adjustment problem. Combined with this, if your handbrake feels like it is correctly adjusted then the handbrake is most likely the problem.