Brake Disc Pads problems of the 1996 Audi A4

This car has a long delay during wet braking and I can not figure out why. When they are warm it is fine, but when they cool off such as on the interstate while driving, when they are needed they do not stop the car. In a situation where stopping is needed quickly, this car would not be able to do this in a decent amount of space. I do not have any aftermarket parts on this car, gy eagle rsa tires all new, not original brake pads, 16" factory wheels. This isnt a normal problem like driving through a puddle and braking, it occurs very often and at the worst times, it forces me to drive in the rain and constantly use the brakes in order to keep the warm enough to evaporate water and keep them working. Mr.