I’m trying to diagnose my braking problems and thought I would post here. I have a K5 with D60/14blt. The front calipers have been ground down to fit 15” wheels. I rebuilt the calipers about a week ago. When I hit the brakes the truck pulls real hard to the right. Also when I hit the brakes I hear an air sound from the brake pedal area. It sounds like I’m pushing on an air bag. I thought it is the brake booster but the brake pedal is not hard, it’s soft. I bled the brakes but it still does it. Could the front calipers be the problem since they are ground down? Any ideas would be great. Thanks.