Change out your brake fluid. This is a must.
Motul RBF 600 is a great fluid and can be used for both your brake fluid and clutch fluid, which also should be swapped before track duty.
The Motul is just a suggestion for an easy to obtain replacement but is also one of the better ones out there.
Personally I use Endless RF 650 for brake fluid and Motul RBF 600 for clutch fluid.
Enjoy the track time!
Edit: Speaking from the personal experience of boiling my stock brake fluid on my 1st track day when I got hard on the brakes at about 140 Mph... and finding I almost didnt have brakes...(was able to duck down a service road thankfully) Boiled my oem clutch fluid that day as well from heat xfer from brake fluid, which resulted in a clutch that didnt work until I bled it.