A casing brake and method of adjusting the casing brake, to allow the casing brake to be adjusted by hand, without making use of any tools, and to guarantee simultaneously that the casing brake cannot be displaced during operation. The casing brake includes a brake ring, inner and outer shells between which the brake ring is tensioned, and a locking element provided between said inner and outer shells, the locking element connected to said inner or outer shell and establishing a positive or a frictional connection with the respective other shell at a locked position, and further having an actuating device for eliminating the positive or the frictional connection.
