We've got an intermittent whining noise on braking with stop/go engaged. Happens about 1/10 stops, more in hot weather and only when stop / go is engaged. Coasting into a stop or applying light brake we hear a rising whirr from the front, like an electric motor or pump. A quick stamp on the brake stops it. Seems to be working ok just making this noise, and intermittent is hard to pick. Any ideas?
