I have a Craftsman 48" Lawn Tractor Model # 917.27684 24HP Electric Start with Auto Trans. It is making a loud whinning noise until i push in the brake. When i put a slight amount of pressure on the brake pedal, the noise will go away. I just put a new Sears drive belt on this mower last year. The noise seems to be coming from the front pully area under the motor. Any help or tips would be great!