i just replaced both front bendix calipers, new pads, both rear wheel cylinders, new shoes and the master cylinder doesnt leak and some how air gets in the system i keep bleeding the front calipers and the air bubbles are there if not every time every other bleed and when i fly down the road for a brake check only the rear tires lock up. the brake pedal is very spungy/squishy and easys to the floor, if any one has any idea as to what my problem could be "that'd be great" much gratitude buick fans thanx ya'll
