I was wondering how i could go about making the brake petal firmer and a little more responsive, I have a 99 GT but I have driven other GT's and GTP's and my brakes feel a little softer, is it the pads? the dealer put new ones on when I bought the car, is it the rotors, or brake lines, or fluid, someone help!!!!

If you ask me.. it's just GM. They've never quite been able to perfect their braking system.
But if you want, you can bleed the brake lines and get any possible air out..

Ive heard that Stainless Steel Brake Lines help firm up the braking.

http://www.pfyc.com/store/merchant.mv?Screen=PROD&Store_Code=PFYC&Product_Code=WB4009&Product_Count=12&Category_Code=GPSUSP

If this article doesn't answer your question I'm not sure it's the brakes anymore...

http://www.sportcompactcarweb.com/editors/technobabble/0212scc_techno/