I have a '96 Grand Am GT. When I apply pressure to the brake pedal it sounds like pulsing noise frome under the hood. There is no change in the pedal, brakes work fine. I suspect the module for the ABS possibly. Any suggestions? Where would I find this module on the car? Is there a sensor bad?

Save yourself some time and money and get the car scanned with an ABS capable scanner. You can spend a lot of money replacing parts and still not get the problem fixed. Spend the money to have someone scan it and it will point you in the right direction rather than going around in circles.