Abstract: The disc brakes of the mine hoist are widely used currently and their failure their analyzed effectively. First of all, the method of the disc brakes monitoring the braking normal pressure which has been commonly used in the mine hoist is studied and the principle of the brakes monitoring the spring force is analyzed. Then, for the dangerous phenomenon of disc brakes failure, the process of disc brakes failure is analyzed based on a disc spring holder sensor. It is evident that the spring force is not equal to the braking normal pressure. Finally, the disk brakes in failure are improved, which effectively solves the failure problem of disc brake.