Abstract: A ski brake comprising at least one spade mounted in a pivot to rotate about an axis between an inactive position in which it is retracted above the ski when a boot is placed on the ski and an active position in which it projects below the sole of the ski. A mechanism is provided for moving the spade from the inactive position into the active position. The axis of the spade is inclined downwards towards the longitudinal axis of the ski and towards the front or rear of the ski so that the spade can move between its active and inactive positions by a rotation of less than 180.degree., enabling association of the brake with known step-in devices.