I had all four brakes done on a Monday. After, I p...

I had all four brakes done on a Monday. After, I picked up the truck I notice a popping sound in the front the end. I took it back Tuesday and they could not hear it. I know the mechanic had forgot to do something they were to embarrassed to admit a mistake was made. I would just like to have some honestly/ integrity when I m paying a lot of money for a simple task.