Abnormal breath sound Pleural rub 2018-07-15T21:53:13Z An abnormal breath sound that is nonmusical, short and explosive. It is grating, rubbing, creaky, or leathery in character and present in both phases of respiration. Typically the expiratory component mirrors the inspiratory component. It occurs due to inflamed pleural surface rubbing each other during breathing. Clinically, it is important to differentiate it from crackles