The Estonian oil shale deposit is heavily watered, which leads to the necessity to pump out a large amount of water during development.

At the shaft No. I of Borislav ozokerite ore management (BORU) since 1946 is operated mine hoisting machine with two drums with a diameter of 4.5 m and width of 1.4 m.

One of the most important tasks of checking and adjusting the braking device of mine hoisting machine is to determine the deceleration at emergency braking.According to safety rules, when lowering a loaded vessel, in case of emergency stop, the deceleration should be at least 1.5 m/sec² and when lifting - no more than 5 m/sec². Consider the method of calculating the pressure in the brake cylinder at emergency braking.