Like was said the 97 and newer Grand Prix's have a much better braking system than that used on 1988 to 96. If the pedal is going to the floor check the fluid level in reservoir on the master cylinder. Add fluid as necessary. One place to check for leaks is the brake pipe that runs cross car (from driver side to passenger side) at the rear suspension area. My 1997 with 119,000 miles sprung a leak in that pipe about a year ago. Couldn't even see where on that pipe it was leaking from because the pipe is hidden by other parts. I knew it was the problem because the fluid was all over the ground directly below it. What first looked like a nightmare to fix actually wasn't bad. I bought some new sections of brake pipe and bent them as necessary to fit. Wasn't able to follow the routing of the original pipe, so I made a new routing. Actually the old pipe is still on the car because it wasn't worth the effort to get it out. One thing to be aware of is the pipe and fittings used is NOT your old double flare type. I believe the correct term is bubble flare and it takes a different flaring tool to make. I was lucky and was able to use the pre-made lengths of pipe (with bubble flare fittings already on them) that I bought without cutting them. Was able to connect to the in-line fitting located under the floorpan in the area of the backseat. Bled the brakes and problem was fixed. For what it's worth my ABS light had come on when the leak started.
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