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 a 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/s² and when lifting – no more than 5 m/s². Let's consider the method of calculating the pressure in the brake cylinder at emergency braking.