Make sure you are as "one" with the bike as possible and use as much of your ass and legs as possible to anchor yourself to your bike. You should already have your ass a bit to the side in the seat. Dont take all the braking forces with your arms.
Dont SLAM the brakes but squeeze firmly. Just to let the front end suspension take the first hit without bottoming out. After that initial firm squeeze, give the brakes all the pressure you dare to. If you are going in fast, you can probably brake 100% without lifting the rear or overloading the front. Try to keep that hard pressure as long as you can, but as the speed goes down you will have to take a little pressure off the brakes when you feel the rear lift too much or the front loosing traction.
The important part is to brake HARD from the beginning of braking and after that try to only brake less and less to find the correct entry speed for the corner and only have very little braking being done after the turn-in. By braking like this it is easy to feel and use the traction. Adding MORE brake pressure near the end of braking is more risky as you "burn the candle in both ends".
This is a video from one of my track days. The interesting thing is the G-force graphs where you can see exactly how hard I am braking. It might not be 100% in sync but you will get my point.
Go to 6.40 minutes in, that is the longest straight on one of my fastest laps.
http://www.youtube.com/watch?v=q6hf7mgKvXs