Abstract: The brake system is one of the important modules of hoist equipment，its performance quality directly determines such key links as the normal shutdown of the hoisting system，working brake，safety brake etc..The hydraulic disc brake system consists of the disc brake device and drive hydraulic station，and it is the highly integrated products of machinery，electron and fluid.Based on the analysis of mechanism of disc brake device，the high-pressure hydraulic station control loops used in auxiliary shaft of Liutangfang Iron Mine is investigated，and the braking working principle of different working mode respectively in different working of brake block loose brake and working brake，secondary braking and constant deceleration braking are demonstrated.Then，the brake pressure is taken as a link to establish the relationship between the braking torque and the oil pressure loop.The hydraulic system setting method of normal operating pressure P_max,secondary braking pressure of the first stage P_1s and the delay time t_1s are summarized，which meet the requirements of the safety rules on braking deceleration，and avoid potential danger that arise from the brake system setting pressure value only determined by the experience in the process of actual use.

Key words: Disc brake device, Constant torque, Constant deceleration, Braking setting calculation