Brake Squeaking Noise problems of the 2017 Chevrolet Silverado

Safety recall calibration to vapor brake system done. After recall completed brakes when pumped more than 1 time the brake pedal recedes to lowest level before stopping and other instances brake pedal only compresses down slightly with increased effort to stop. A load squeaking noise is associated with brake pedal going down far to floorboard. Before recalibration of vapor system per recall notice this was not as frequent a problem. Chevrolet dealership is not acknowledging or reproducing this absent problem. They refuse to assist further as per cevrolet customer support they will not repair unless they drive and find problem. They diagnosed it as no problem the vehicle is in motion coming to a hopeful stop when problem occurs.