GMC Repair: brake problems, buick regal, brakes

Question
I own a 92 buick regal gs. I've had both the rear and front brakes replaced and still no brakes. I haven't notice any fluids in the drive and not sure what else could be causing the problem. The pedals go to the floor and the only way to stop the car is to throw it into park (i've done this twice)
please help!

Answer
I really do advise you to get this car to your local dealer and let them look at it. I would have to say that you probably have something wrong in the anti-lock system, however I do not mess around when it comes to braking concerns. This is too important and delicate of a subject to try and diagnose without being able to see the car.