Simply stated....You need a brake job.

One of your calipers may also be sticking. You should just do a front brake job, mabey a new set of rotors while your there. You may be able to get away with cutting down your rotors, but our cars are best with new ones. There not that much anyhow, put some nice cross drilled\slotted ones up there, there made for people like you.
"people who like speed"

While you have your brakes apart, make sure you have movement in both calipers and pistons, and neither are frozen or slow.

Throw a nice new set of pads and you should be all set..

Good Luck. If you need any more help hit me up on aim...I can walk you through it.:thumbsup