1996 A4 buzzer sounds when I put the brake on
 

Why does the buzzer go off when I put my foot on the brake pad

Need more input data.........

Well, I have a 1996 a4 and with the car not on when I get in and step on the brake pedal the buzzer goes off. The buzzer is the one that will sound if you leave your lights on with the car off and you open the drivers door. Hope that's enough Info. Thanks in advance